Slice the onions and shiitake mushrooms thinly.
Prepare the thinly sliced pork belly.
Add a little cooking oil to a pan and stir-fry the pork belly.
When the pork belly is halfway cooked, add the onion and shiitake mushrooms and stir-fry together.
Season with soy sauce, sugar, and minced garlic.
When the ingredients are well-cooked and seasoned, serve on a plate.