What is the slag river surface for?

The practice of Zhajiang Noodles fried sauce is as follows:

1, mince onion, ginger and garlic, mince onion, cut dried bean curd into small tintin, make pork belly into minced meat, or buy minced meat directly.

2. Put 2 tablespoons of sweet noodle sauce, 1 tablespoon of soy sauce, half a spoonful of bean paste, 2 tablespoons of soy sauce, 1 tablespoon of oyster sauce, 1 tablespoon of soy sauce, 1 tablespoon of sugar, and 1 tablespoon of starch into a bowl and stir evenly, then add half a bowl of clear water and continue to stir evenly.

3. Put oil in the pan, add onion, ginger, garlic and minced onion until fragrant, add minced pork belly, stir-fry until it becomes discolored, add cooking wine, stir-fry for about 1 min, pour in dried bean curd, stir-fry for 2 minutes, pour in the prepared sauce in the bowl, and turn to low heat after boiling.

4. Simmer for three or five minutes with low fire, and observe the thickness. After it is cooked, you can turn off the fire.