Dice the onion and potato.
Slice zucchini and green onion appropriately.
Add the canned tuna with its oil into a pot and stir-fry.
Add gochujang and minced garlic, stir-fry together.
Pour 300ml of water and add potato, zucchini, and onion.
When it boils, add tofu, green onion, chili powder, and soy sauce.
Taste when ingredients are cooked and season with salt.