Slice the shiitake mushrooms thinly.
Julienne the onion and carrot.
Add cooking oil to a pan and heat over medium heat.
Stir-fry the mushrooms, onion, and carrot.
Add seasonings such as soy sauce, minced garlic, sesame oil, and pepper, then continue stir-frying.
Once the ingredients are cooked, add green onion at the end, stir-fry once more, and finish.