Cut tofu, zucchini, onion, potato, and green onion into bite-sized pieces.
Fill a pot with water and make broth using anchovies and kelp.
Remove the anchovies and kelp, then add potatoes and onions and bring to a boil.
Add zucchini, tofu, and mushrooms.
Stir in doenjang (soybean paste) and mix well.
Add minced garlic and chili pepper, then season to taste.
Finish by adding green onion and boil briefly once more.