To Make the Dashi
- Start by adding the water and kombu to a saucepan and bringing to a boil.
- When the water is boiling, add the bonito flakes and simmer for 10-15 minutes.
- Remove the saucepan from the heat and strain the water.
- Combine the marinade ingredients and add the cut fish to marinade for at least 10 mins.
- Spoon rice in to a large bowl and place the marinaded fish on top. Sprinkle with the seaweed and serve with soy sauce, wasabi and the rest of the dashi.