Remove excess moisture from the tofu using a paper towel, then cut it into bite-sized pieces.
Julienne the cucumber and carrot thinly.
Blanch the spinach in boiling water and squeeze out the excess water.
Drain the oil from the canned tuna using a strainer.
Place rice in a bowl and top with tofu, tuna, and vegetables.
Add gochujang, sesame oil, and sesame seeds, then mix well.