Sift 100 g cake flour and ⅛ tsp baking powder into a large bowl. and add the 75 ml dashi stock, 1 tsp milk, 1 tsp Japanese soy sauce (koikuchi shoyu), 1 tsp mirin and 1 egg to the bowl. Mix until the ingredients are well incorporated, but be careful not to over mix.
Cover the bowl and rest it in the fridge for 30 minutes.
Okonomiyaki Sauce
Take a small bowl and add 2 tbsp tomato ketchup, 1 tbsp Worcestershire sauce, 1 tbsp oyster sauce, 1 tbsp honey and 1 tsp Japanese soy sauce (koikuchi shoyu). Mix well and set aside for later.
Fillings
Cut the 150 g green cabbage into into small rough pieces.Once the batter has been resting for 30 minutes, pour half of it into a new bowl. Place the original bowl back in the fridge for later. Alternatively, make two simultaneously in two separate frying pans.
Start preheating your pan on a medium/medium-high setting.While you wait, add half of the cabbage to the bowl of batter along with 1 tbsp tempura flakes, and 1 tsp red pickled ginger. If you want to add other ingredients such as cheese, kimchi, mochi etc add them here. See in post for more ideas. Mix until everything is evenly distributed.
Add 1 egg and mix again until it's incorporated. Be careful not to over mix.
Add the oil to the pan and swirl around until evenly coated. Wipe out the excess with kitchen paper and pour the okonomiyaki mixture into the center of the pan. Use a spatula to neaten up the edges.
Lay the slices of pork belly over the top of the wet mixture and fry the okonomiyaki until the bottom starts to become brown and crispy.
Carefully flip it over and place a lid on the pan. Reduce the heat to medium-low and continue to fry with the lid for about 5 minutes or until cooked all the way through.
Pierce the middle with a toothpick to make sure it's cooked. If the toothpick doesn't come out clean, continue to cook on a low heat and check it every few minutes until it's done.
Once it's cooked through, flip it over again and pour half of the sauce over the top. Use a pastry brush or spoon to spread it evenly. You can do this while it's still in the pan or transfer it to a plate first.
Drizzle with mayonnaise and sprinkle generously with bonito flakes and aonori then repeat steps 2-8 with the other bowl of batter in the fridge. Enjoy!
Notes
If you can get okonomiyaki flour, then you can replace the dashi stock with plain water. Check the package for more detailed instructions.
This recipe makes two okonomiyaki pancakes, which should be enough for 2-4 people.
Use cake flour for a light, soft texture, or substitute with all-purpose flour if you have to.
Cool dashi completely before mixing with flour to prevent sticky, heavy batter.
Freeze cooked, cooled quarters without sauce for up to 1 month. Microwave to heat through, then skillet-sear or toaster oven to bring back a bit of texture before adding toppings.