Ingredients: mushrooms? About 20, onions? 1, garlic 8 petals, flour? 5 tablespoons, oyster sauce? 5 tablespoons of ketchup? 6 tablespoons, water? 600ml, salt? Right amount, black vinegar? 1/2 teaspoons, black pepper? A moderate amount (a little).

Steps:

1, onion, sliced mushrooms and minced garlic.

2. Put the oil in the pot and fry the minced garlic first.

3. Add onion and stir fry.

4. Add the mushroom slices and fry until the onion is transparent.

5. Add flour in batches.

6. Add tomato sauce and oyster sauce.

7, add water to boil, you can try the taste, according to personal taste, add salt, and black pepper. Black vinegar adds flavor.

8, thick consistency, water volume, you can fine-tune yourself.

9. Bottle while it is hot, which can be filled in vacuum. Cool and store in the refrigerator.