Cut the tuna and salmon into bite-sized pieces and place them in a bowl; sprinkle with salt.
Stir in the sliced green onions.
To the fish, add soy sauce, sesame oil, and rice vinegar; toss to combine. Set aside.
Next, make the cucumber salad; Place diced cucumbers in a bowl, and to the cucumbers add the rice vinegar, sesame seed oil, sugar, salt, and pepper. Toss to combine.
Assemble: divide the cooked rice between 4 bowls.
Top the rice with the salmon, tuna, cucumber salad, mango, avocado, and/or any of the other desired toppings.
Serve.
Notes
The nutrition facts are approximate, provided as a courtesy, and do not include all of the possible ingredients (such as all the possible toppings and sauces) in this recipe.
Nutritional info is an estimate and provided as courtesy. Values may vary according to the ingredients and tools used. Please use your preferred nutritional calculator for more detailed info.