Dice the tofu into small cubes.
Finely chop onion, zucchini, and spicy chili pepper.
Heat sesame oil in a pot and sauté minced garlic.
Add the vegetables and stir-fry together.
Add soybean paste and gochujang, then stir-fry.
Pour water and add the tofu, then simmer gently.
Season to taste and finish by adding green onion.