Rice bowl style
Cut tofu, zucchini, and onion into bite-sized pieces.
Add cooking oil to a pan and grill the tofu until golden brown.
Push the tofu to one side and add zucchini and onion to stir-fry.
When the vegetables are slightly cooked, add canned tuna.
Season with soy sauce, salt, and pepper.
Stir-fry all ingredients evenly until done.