Exercise:

1. Sauce: 1 spoon soy sauce+1 spoon oyster sauce+half a spoon soy sauce+1 spoon vinegar+1 spoon sugar+1 spoon corn starch+half a bowl of water, and stir well for later use.

2. Wash potatoes, peel them and cut them into small pieces. Fry them in the oil pan until golden brown. Heat oil in a pan, add onion and garlic, pour potatoes and mix well.

3. Add sauce and 2 bowls of water, bring to a boil, serve a bowl of soup, spread a layer, cover and stew for 8 minutes, and pour in the soup.