Bullfrogs should be cooked for 30-40 minutes as follows:

1. Wash the bullfrogs with water, remove the head, feet and internal organs, and cut them into chunks.

2. Blanch and boil the bullfrog pieces in boiling water to remove surface foam.

3, add appropriate amount of ginger and cooking wine, continue to cook for 10 minutes.

4, add appropriate amount of salt and soy sauce, and cook for about 20 minutes more until cooked through.

5, sprinkle with appropriate amount of chopped green onion to serve.