Cut the beef tenderloin into bite-sized pieces.
Prepare and slice the tofu, potato, zucchini, onion, and shiitake mushrooms.
Pour water into a pot, add anchovies and kelp to make broth, then remove the anchovies and kelp.
Add the prepared vegetables to the broth and bring to a boil.
When the vegetables are cooked, dissolve doenjang (soybean paste) into the broth.
Add the beef tenderloin and simmer until the meat is cooked through.
Season with minced garlic and sliced green chili peppers.
Serve the finished stew in a bowl.