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It was very time consuming but so worth it, the broth was delish and served cold so it was perfect for summer 🌞
– @rv.cooks (from Instagram)
Freshly fried tempura is not finished yet. What finishes it is not the oil, it is the broth waiting underneath.
Once the coating drinks that broth in, it takes on the earthy soba and the savory dashi together. The crisp does not get lost, it turns into a different texture. This bowl shows its best face in the 30 seconds while that is happening.
Tempura soba
Recipe Snapshot
- What is it? A hot Japanese noodle bowl of buckwheat soba under fresh tempura. Kanto keeps the broth dark in color, Kansai pale with lighter soy sauce.
- Flavor profile: Soba brings a grainy buckwheat aroma, the broth a bonito flakes and kombu base with soy sauce underneath. Tempura oil melts in as you eat, and the broth rounds out.
- Why this recipe works: I keep the batter light, so it drinks broth without going doughy. I leave sugar out of the soup, so the lean earthy soba aroma holds to the end.
- How to make it: 3 pots, no overlap. I finish the broth, fry all the tempura, then boil the soba, so a first-time fryer still has enough hands.
- What to expect: Tempura soba serves 4. Hands-on work runs about 30 minutes, plus 30 minutes chilling, for 1 hour total. Let the oil drop and the coating drinks it in.
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What Is Tempura Soba?
Tempura soba is a Japanese noodle dish, buckwheat soba in a hot dashi based broth, with freshly fried tempura on top. We shorten the name to tensoba. Soba in the broth on its own is kake soba, and the shrimp or vegetable tempura is what makes it tempura soba.
Soba is milled from buckwheat, so it carries a grain aroma that wheat noodles do not have. Some people picture tempura soba as cold noodles with tempura on the side. The default is the hot bowl. The cold version has its own name, tenzaru.
An 1827 senryu poem already mentions tempura soba, so the name goes back at least that far. Past that point the trail runs out. Back then tempura meant battered and fried seafood only. Vegetable versions went by other names. The wide category we use today came later. What sat on Edo tempura soba was shiba shrimp (ebiten), small ones caught in Tokyo Bay. Late Edo records of daily life describe 3 or 4 of them fried and laid on the bowl. Land reclamation and development in the Showa era took the shiba shrimp away, and kuruma shrimp stepped in. The big shrimp you buy today sit at the end of that handover.
Order tanuki soba in Kanto and what arrives is soba topped with tenkasu alone, the crisp bits of batter left over from frying. No tempura on it. Order it expecting a relative of tempura soba and a different dish shows up. In Osaka the words trade places. Tanuki there means soba topped with fried tofu, and the bowl with tenkasu is called haikara. The same word points at a different bowl once you cross that line.
Tempura Soba Ingredients
What You’ll Need for Tempura soba
- Soba noodles: Buy these by the buckwheat percentage printed on the back of the bag. My own line is 80 percent buckwheat to 20 percent wheat, which is where the grain aroma comes through and the strands still hold together in hot broth. Some bags do not always match their label, and once wheat takes over you lose the aroma and keep only a rubbery chew. If the noodle has no smell of its own, the batter and the dashi take the entire bowl. Look in the dried noodle aisle of any Asian grocer.
- Dashi stock: This is the floor the broth stands on, and it is usually where a home version of tempura soba falls short of a shop bowl. Pulling katsuobushi (dried bonito flakes) and kombu together gives you a savory depth that neither ingredient reaches by itself, and this bowl needs that strength.
- Black tiger shrimp: The flesh does not shrink away to nothing in the fryer, and the price and the availability land in a reasonable place. Size 16/20, the count per pound, is my target. Frozen from an Asian grocer works fine.
What You’ll Need for Tempura Batter
- Unbleached cake flour: I use it to push the coating toward the light side. Cutting cornstarch into it holds back the stickiness of the wheat, so the coating does not turn heavy once it has taken on broth.
Substitutions, Variations, and How to Customize
Even when something on the list is out of reach, this bowl rearranges without falling apart.
Substitutions:
- Soba → Udon: It works, but you are making a different dish. The earthy note of the buckwheat disappears, so what meets the coating as it drinks the broth changes and the whole bowl softens at the edges. If udon is what you actually want, go and look at my shrimp tempura udon recipe instead.
- Shrimp → Kakiage (mixed vegetable fritter) or vegetable tempura: On a week when shrimp is expensive, or if shellfish is off the table for you, swapping out the contents of the tempura is the practical move. Onion and carrot kakiage, sweet potato, lotus root, or asparagus all hold the bowl together without trouble. Kakiage is the most common sight at a standing soba counter in Japan, so this is not a step down.
- Dashi → Kombu and dried shiitake, or dashi packets and granules: How you pull it is open. Kombu with dried shiitake gives you savory depth with nothing animal in it, and packets or dashi granules save you a pot, but what is flexible here is the method and not the savory base itself. Granules carry a fair amount of salt, so pull the soy sauce back a little if you go that way.
- Cake flour → All-purpose flour: Use it straight across. Plain flour in the UK and Australia is unbleached, so for this job it actually sits closer to cake flour than you would think. It picks up stickiness faster, which means mixing less, keeping everything cold, and leaving the lumps alone all count for more.
- Carbonated water → Cold water: Plain cold water gets you there. The bubbles take the coating one step lighter, but nothing fails without them. Either way, keep it cold enough that ice is floating in it.
- Egg → Leave it out: A batter with no egg still fries up. If that is where you are, take a look at my egg-free tempura recipe.
- Shiitake, eggplant, and perilla → Seasonal swaps: Sweet potato, kabocha, lotus root, bell pepper, okra, and squid all work here. Let the season and your fridge decide what goes into the oil. Root vegetables take time to cook through, so run them lower and slower, and take the leaves and the squid hotter and faster.
Have trouble finding Japanese ingredients? Check out my ultimate guide to Japanese ingredient substitutes!
Variations:
- Go Kansai style with the broth: Swap the katsuobushi-heavy broth built on standard Japanese soy sauce for a kombu-led dashi with usukuchi, the light-colored soy sauce, and the broth turns pale and easier to drink. Usukuchi carries more salt than the standard kind, so use less of it.
- Turn it into tenzaru: Chill the noodles, put the tempura on its own plate, and dip into a stronger sauce as you eat. If you want the coating crisp from the first bite through the last, this is the clearest answer there is. My zaru soba recipe covers the cold noodle side of it.
How to Customize:
- Add tenkasu: Save the scraps of batter that break loose in the oil and scatter them over the top. Honestly, turn every bit of leftover batter into tenkasu and keep it. My tenkasu recipe is there if you want to go that way.
- Lay grated daikon on top: It pulls the weight of the fried food back down. It also brings the edges back when the sweetness in the broth starts running ahead of everything else.
How to Make My Shrimp Tempura Soba
Before you start (Mise en place):
- Get the cake flour, the cornstarch, the cold water, the carbonated water, and the egg into the fridge 30 minutes before you use them.
- Alongside the shrimp I am frying shiitake, eggplant, and perilla leaves. Pull the stems off the shiitake, cut the eggplant into wedges and soak them in cold water, wash the perilla and pat it dry.
- Right before you fry, wipe the surface of everything down again.
Tip: The hardest part of this dish is watching the noodles and the broth while you are also standing over hot oil. So do not do them at the same time. Make the broth and take it off the heat, fry everything through, and boil the soba last. Tempura can wait a little. Soba cannot. The one that cannot wait goes last.
To develop this recipe, I used a tempura pot with a built-in thermometer.
i. Peel the shrimp, leave the tails on, and devein them. Rub with salt and cornstarch, wait a few minutes, then rinse under cold water and pat dry.
ii. Lay the tail flat, fold it in half, and trim it diagonally. Take the pointed tip off and the oil will not spit at you.
iii. Turn the shrimp belly up and cut diagonally about every 1 cm, halfway through the body.
iv. Still belly up, hold both sides and press along from the tail end. A small snap means the fibers have given.
i. Bring the dashi to a boil in a pot, then add the soy sauce and the mirin.
ii. Let it go 2 to 3 minutes, kill the heat, and stir the salt in.
iii. Lid on, set it aside. You do not need it again until the very end, so finish it now and forget about it.
i. Combine the chilled cold water and carbonated water in a bowl, crack in the egg, and whisk. Skim any foam off and throw it away.
ii. Add the chilled cake flour and cornstarch in 3 goes, folding roughly each time. The lumps are supposed to be there.
iii. Dust the shrimp and the vegetables lightly with flour and knock the excess off.
Tip: Judge the mixing by the film it leaves on the food, not by whether the flour has disappeared. Lift a piece and you want a thin, even coat on it. If it runs off and the surface shows through, there is not enough flour. If it sits there in a thick blob, you have mixed too much.
The coating on this bowl is not finished when it comes out of the oil. It finishes in the broth. A thick, heavy coat turns into a dumpling once it drinks. Bring it up light and it holds, and the crisp top and the soaked underside land in the same mouthful.
i. Heat the oil to 180°C (356°F). A bead of batter should scatter across the surface instead of sinking.
ii. Fry by type, a batch at a time, perilla leaves first, then shiitake, eggplant, and shrimp. The oil gets reused all the way through, so whatever dirties it least goes in first.
iii. Do not crowd the pot. When the coating puffs and crisps, lift it out before the color sets and spread the pieces on a rack rather than stacking them.
iv. Skim the loose bits as they float, and return the batter to the fridge between batches.
As you fry, pieces of batter break loose from the food and scatter across the oil. Those little scraps are called tenkasu. Left alone they burn and turn the oil bitter, and that bitterness carries into whatever you fry next, so you scoop them out as you go. In Japan nobody throws them away. They get saved and used in other dishes such as devil’s onigiri or on top of noodle soup like this.
i. Boil the soba in a separate pot of water, following the time on the package. No salt in the water. Soba is not a noodle you season from the pot, and the salt will not go in anyway.
ii. Drain into a colander, drop it into cold water, and rub the surface as you wash it.
iii. Drain it hard.
iv. If you want the noodles hot, boil fresh water, dip them for a few seconds, and drain again. You can skip this.
v. Divide into bowls.
The surface of the noodle still carries dusting flour and the starch that came out of it while it boiled. Put that into the broth unrinsed and the broth goes cloudy and the strands stick to each other. Rub it off under cold water and the edges sharpen, and the broth tastes like itself.
i. Reheat the broth you set aside and pour it over the noodles.
ii. Lay the tempura on top and add green onion and shichimi to taste.
If you follow the default recipe, it will yield 4-5 servings.
Tips for the Best Tempura Soba Noodles
- Stop mixing while you can still see dry flour. A smooth batter is the failure here, and lumps are the sign you got it right. The more you work it, the more gluten develops, and the coating turns heavy and drinks oil. A few cutting strokes with chopsticks is all it takes.
- Judge by sound, not by a timer. The big noisy bubbles right after you drop something in are water leaving. As the piece cooks, the bubbles shrink, the sound goes light and dry, and the piece feels weightless when you lift it with chopsticks. When all 3 of those line up, pull it out.
- Put the tempura on at the last moment. Soaking the coating is the design, but when it soaks is yours to decide. Carry the bowl to the table first and add the tempura there, and the first bite is still crisp. If you want crisp all the way through, serve the tempura on a side plate and dip it in the broth as you go.
None of these is about frying tempura to perfection on its own. They are about building a coating that is at its best once it has taken on broth.
Storage & Meal Prep
Fridge: Broth a week, boiled soba about 2 days. Fried tempura goes limp, keep it out.
Freezer: Broth and soba freeze. Tempura holds about 2 weeks but never light again, freeze only what you cannot finish.
Meal prep: Make the broth ahead. Batter cannot, mix it cold right before frying.
Reheating: Tempura in a toaster oven or an air fryer. Rinse soba cold, then dip in fresh hot water. Warm the broth, never boil.
What to Serve With Tempura Soba
- Salted Onigiri (Shio Musubi)
- Inarizushi (Inari Sushi)
- Easy Takuan (Pickled Daikon)
- Kappa Maki (Cucumber Sushi Roll)
Tempura Soba Soup Troubleshooting
No. The coating on this bowl is built to drink broth, and going soft is where it is meant to land. What actually goes wrong is not the softening, it is not choosing when it happens, so carry the bowl to the table before you lay the tempura on. That alone keeps the first bite crisp.
The tendons along the belly are still intact. Press along the belly until you hear that small snap and it will not happen, so check that on the next shrimp before you flour it. The ones already fried only look wrong, and the curl changes nothing about the taste. Put them on the bowl as they are.
They were not washed enough, so dusting flour and released starch are still sitting on the surface. If the noodles are already in the bowl, lift them out, rinse them again in cold water, and warm them through in hot water. That still works. The cloudy broth will not clear, so let that one go and take it back on the next bowl.
More Soba Noodle Recipes
- Duck Soba
- Nikutama Ankake Soba
- Sesame Soba
- Hiyashi Kitsune Soba
Once the sobe noodles click, changing what sits on top is enough to make it a different bowl, and my Japanese soba recipe collection has those swaps lined up.
Did You Try This Recipe?
I would love to hear your thoughts!
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Tempura Soba Noodle Soup (Tensoba)
Ingredients
Tempura
- 150 ml cold water thoroughly chilled in the fridge
- 100 ml carbonated water chilled, or use extra cold water instead
- 30 g cornstarch
- 150 g unbleached cake flour or pastry flour, low-protein, around 7-8%
- unbleached cake flour as needed, for dusting
- 1 egg chilled
- 8 large shrimp 16/20 count is the guide, shelled with the tails left on
- 4 fresh shiitake mushrooms stems removed
- 100 g eggplants cut into wedges and soaked in cold water
- 8 perilla leaves (shiso)
- cooking oil neutral with a high smoke point, such as rice bran, rapeseed or vegetable oil
Soba and tsuyu
- 1000 ml dashi stock made with bonito flakes and kombu
- 5 tbsp Japanese soy sauce (koikuchi shoyu)
- 2 tbsp mirin
- ½ tsp salt
- 400 g dry soba noodles about 100 g per serving, check the bag for an 80 percent buckwheat blend
Toppings (optional)
- finely chopped green onions as needed
- kamaboko fish cake as needed
- Japanese chili powder (shichimi togarashi) as needed
- dried wakame seaweed rehydrated, as needed
The ingredient brands and tools I trust are in my Japanese pantry guide and my cooking tools guide.
Can’t find certain Japanese ingredients? See my substitution guide here.
Instructions
- Chill 150 g unbleached cake flour, 30 g cornstarch, 150 ml cold water, 100 ml carbonated water and 1 egg in the fridge for 30 minutes.
- Shell 8 large shrimp, leave the tails on and pull out the veins. Rub them with salt and cornstarch, rinse under cold running water and pat dry.
- Lay each tail flat, fold it in half and trim it at an angle. Turn the belly up and cut slits 1 cm apart, halfway into the flesh. Hold both sides with the belly still up and press from the tail end until you hear a small snap.
- Bring 1000 ml dashi stock to a boil in a saucepan and add 5 tbsp Japanese soy sauce (koikuchi shoyu) and 2 tbsp mirin. Simmer 2 to 3 minutes, turn off the heat and stir in ½ tsp salt. Cover and set aside.
- While the broth cools, remove the stems from 4 fresh shiitake mushrooms, cut 100 g eggplants into wedges and soak them in cold water, then wash and dry 8 perilla leaves (shiso).
- Heat the cooking oil to 180 °C (356 °F). Combine the chilled cold water and carbonated water, beat in the egg and skim off the foam. Add the chilled dry mix in 3 additions, folding roughly each time. Leave the lumps.
- Dust the shrimp and vegetables with cake flour and shake off the excess. Coat and fry them in batches by type, in the order of perilla leaves, shiitake, eggplant and shrimp. Lift each piece out as the batter puffs and before it colors, and spread it on a wire rack. Skim the loose batter each time.
- Bring water to a boil in a separate pot and cook 400 g dry soba noodles to the time on the bag. Drain, rinse under cold water while rubbing the surface, and drain again. For hot soba, boil fresh water, dip them for a few seconds and drain once more.
- Divide the soba between bowls, reheat the tsuyu and pour it over. Add the tempura, then scatter finely chopped green onions, kamaboko fish cake, Japanese chili powder (shichimi togarashi) and rehydrated dried wakame seaweed to taste. Enjoy!
Very good, detailed recipe and excellent instructions. Many thanks for sharing.
Thank you so much, Lucy! I’m glad the it was helpful! 🙂
Yuto