1. feed selection: turtle feed may be the source of bitterness. Please try to change the brand or type of food, or feed them fresh fruits, vegetables, fish and insects and other high-protein foods.

2. Wash in advance: Before cooking, please wash the soft-shelled turtle and remove its internal organs to reduce the source of bitterness. Soaking soft-shelled turtle in light salt water or adding some vinegar in water can also remove bitterness.

3. Cooking method: Avoid high-temperature processing methods such as frying, because this may cause the turtle to become bitter or hard. You can choose steaming or boiling.

4. Add other ingredients: You can cover up the bitterness by adding ingredients such as onion, ginger and garlic or seasonings with suitable taste.

5. Time: Sometimes the turtle needs some time to discharge bitter substances from the water, so you may need to soak it in cold water for a while before handling it.

Please note that different kinds of soft-shelled turtles may have different bitter sources and solutions. If the problem persists, consult a professional.