It’s because there is a kind of limonin in grapefruit peel, which is made from naringin. It will be bitter when cooked. You can make honey grapefruit sauce and boil water, and it will not be bitter. How to make honey grapefruit sauce As follows:

Preparation materials: 1 grapefruit (about 1500 grams), 200 grams of rock sugar, appropriate amount of honey, 1 cup of water

1. Soak the grapefruit in a basin of warm water for ten minutes. Sprinkle a little salt on the grapefruit, rub it with your hands, or gently scrape the skin with a knife.

2. Use a paring knife to peel off a thin layer of grapefruit peel. The thinner the better, try not to get the white part.

3. Cut the scraped grapefruit peel into shreds.

4. Boil the shredded grapefruit peel in water for two to three minutes.

5. Soak the blanched grapefruit peel in cold water for three to four hours.

6. Grapefruit: Remove the white fascia and grapefruit seeds inside the grapefruit, retain the pulp, and break it into small pieces.

7. Break the grapefruit pulp into small pieces and put it into the pot, add rock sugar and a bowl of water.

8. Add the soaked grapefruit peel.

9. Bring to a boil over high heat, then turn to low heat.

10. After cooking for about 30 minutes, the soup has reduced and the grapefruit shreds have become translucent. Still have to cook. At this time, stir frequently to prevent sticking to the pan.

11. After cooking for about 45 minutes, there is almost no soup left.

12. Let it cool to lukewarm, add honey and mix well.

13. Mix well, cool down, cover tightly and store in the refrigerator.