Rinse the dried shiitake mushrooms and soak them in water until softened. Strain the soaking water to remove impurities and reserve it as broth.

Prepare a rich broth by combining the reserved mushroom soaking water with natural seasonings in a sachet. Simmer until flavorful.

Squeeze excess water from the soaked shiitake mushrooms and mix them with button mushrooms. Add minced garlic, chopped green onion, and soy sauce.

Add the mushroom mixture to the prepared broth and bring it to a boil over high heat.

Add soft tofu to the boiling broth. Use crumbled soft tofu for a smoother texture.

Once the soup is boiling and flavors are well-integrated, add perilla seed powder. Adjust seasoning with salt if needed.