Cut the thinly sliced pork belly and vegetables into bite-sized pieces.
Place vegetables such as onion, carrot, potato, and mushrooms on the bottom of a pot.
Place the thinly sliced pork belly over the vegetables.
Mix soy sauce, minced garlic, sugar, pepper, and water to make the seasoning sauce.
Pour the seasoning sauce evenly over the ingredients.
Cover with a lid and steam over medium-low heat for 15 minutes.
When all the ingredients are cooked, transfer to a plate and serve.