Dice the salmon and tuna into bite-sized cubes.
Julienne the avocado, cucumber, and carrot.
Prepare a bowl of rice.
Make a sauce by mixing soy sauce, sesame oil, mirin, and sugar.
Top the rice with the diced salmon, tuna, avocado, cucumber, and carrot.
Drizzle the sauce over and add toppings like seaweed and sesame seeds.