Cut tofu, zucchini, onion, green onion, and spicy green chili into bite-sized pieces.
Pour 400ml of water into a pot and make broth with anchovies and kelp, then remove them.
Dissolve 1 tablespoon of doenjang (soybean paste) in the broth and bring to a boil.
Add zucchini and onion and boil for 2 minutes.
Add tofu, spicy green chili, and green onion.
Add 1 teaspoon of minced garlic and simmer a bit more.