Tip: I recommend soaking your rice before you start this recipe, 30 minutes (or 1 hour in winter).
Start by soaking 3 dried shiitake mushroom in 200 ml cold water until rehydrated (about 30 minutes).
Next, make the marinade for the tuna. Take a small saucepan and add 1 tbsp sake and 1 tbsp mirin. Boil for 30 seconds to remove the alcohol, and then turn off the heat.
Add 1 tbsp Japanese soy sauce (koikuchi shoyu) to the pan and mix. Allow to cool for a few minutes.
Once cool enough to touch, place the cubed 75 g sashimi grade tuna into a container and pour the sauce over it. Mix well, cover, and marinate in the fridge until serving time.
Use this soaking/marinating time to prepare all of your toppings according to the ingredients list. You can also use this time to cook your rice either in a pot or in a rice cooker.
Rice
Once the mushrooms are rehydrated, the water becomes a concentrated shiitake dashi. Pour the dashi into a pan and squeeze the shiitake to release any excess liquid. Cut them into thin slices and add them to the pan along with 1 carrot and 30 g fried tofu pouch (aburaage) - also thinly sliced.
Add 1 tbsp sake, 1 tbsp sugar, 2 tbsp mirin and 2 tbsp Japanese soy sauce (koikuchi shoyu). Mix well and cook over a medium heat until the liquid is gone. Mix occasionally to ensure the ingredients do not burn.
Once the liquid is gone, remove the pan from the heat.
In a small bowl, mix 2 tbsp rice vinegar, 1 tbsp sugar and ½ tbsp salt until dissolved. This is your homemade sushi vinegar.
Pour the sushi vinegar over 660 g cooked Japanese short-grain rice (hot, freshly cooked) and mix thoroughly.
Empty the contents of the pan into the rice and mix gently until evenly distributed, then cover with a damp kitchen towel to prevent the rice from drying out.
Kinshi Tamago
Crack 2 eggs into a bowl with 2 pinches salt and whisk well.
Pour the whisked egg through a sieve placed over another bowl and whisk until it passes through.
Heat a small non-stick frying pan on a medium-low setting and add 1 tsp cooking oil. Use a paper towel to spread the oil around the pan and remove the excess. Keep the paper towel for later.
Pour the whisked egg into the pan to create a thin layer. You will need to cook the kinshi tamago in batches to ensure it is not too thick (depending on the size of your pan).
Lift the pan and swirl it around to spread the egg, then cook until the egg is 80% done (slightly soft on the surface). Lifting the pan off of the heat source occasionally will prevent it from browning.
Peel the egg out of the pan, transfer it to a chopping board and roll it up. Thinly slice using a sharp knife to complete the kinshi tamago. Repeat these steps until all of the egg mixture is used.
Assembly
Transfer the rice into the serving bowl(s) and sprinkle with 3 tbsp kizami nori (shredded nori).
Spread the kinshi tamago over the top.
Arrange the rest of your ingredients (25 g lotus root (renkon), 100 g shrimp, 15 g marinated salmon roe (ikura), 2 tbsp sweet pink fish powder (sakura denbu), 10 snow peas and marinated tuna) on top.