Boil spaghetti in salted water.
Chop pepper and mushrooms as you like, chop onion and garlic finely. Fry vegetables in oil for about 10 minutes. Season to taste.
When the mushrooms become soft, add soy sauce, then pour the spaghetti into the pan and mix.
Spaghetti with vegetables and soy sauce are ready, sprinkle with chopped herbs and serve.