Wash the eggplant and mushrooms thoroughly, then cut them into bite-sized pieces.
Finely chop the onion, green onion, and garlic.
Heat cooking oil in a pan and sauté the garlic and green onion.
Add the eggplant, mushrooms, and onion, and stir-fry together.
Add soy sauce, chili powder, sugar, and water, then mix well.
Simmer over medium-low heat until the ingredients are cooked through.
Season with pepper, then finish by drizzling sesame oil and sprinkling sesame seeds.