Finely chop the shiitake mushroom, onion, green onion, and chili peppers.

Cut the soft tofu and place it in a bowl.

Heat sesame oil in a pot over medium heat, add minced garlic, onion, and shiitake mushroom, and sauté for 1 minute.

Add fish sauce and sauté for another minute.

Pour 220ml of water into the pot and boil for 5 minutes to create a flavorful broth.

Add the soft tofu to the pot and boil for 1 minute.

Add chopped green onion, chili peppers, and perilla seed powder, and simmer for 30 seconds.

Taste and adjust seasoning with salt as needed.