Cut tofu, zucchini, onion, green onion, and mushrooms into bite-sized pieces.
Add sesame oil to a pot and stir-fry pork and minced garlic.
Add red pepper powder to the meat and continue to stir-fry.
Add onion, zucchini, and mushrooms, and stir-fry together.
Pour in water, soy sauce for soup, and salt, and bring to a boil.
When it starts boiling, add the soft tofu and let it simmer a bit more.
Add green onion for the finishing touch.