The taste of Anjing roe bag is very sour, which may be caused by the ingredients or cooking methods used in it. The specific reasons may include the following aspects:

1. Food problem: The roe in the roe bag may be stored for too long, which may cause the roe to deteriorate and produce sour taste.

2. Improper storage: If the fish egg bag is not kept at a proper temperature during storage, the ingredients inside may deteriorate and produce sour taste.

3. Cooking method: If the cooking process takes too long or the heating time is too long, the ingredients may be sour.

In a word, the taste of Anjing roe bag is sour, which may be caused by the ingredients, improper storage or cooking methods. When buying and eating, it is recommended to choose products with good quality and good taste, and pay attention to the correct storage and cooking methods.