2. Wash the grapefruit with salt for several times, rinse it clean, then control the moisture, peel it with a paring knife, and then cut the skin into filaments.

3. Then, take out the pulp for later use, put the grapefruit peel into a bowl, add salt and water, clean it, and control the moisture for later use.

4. Put water, rock sugar, grapefruit peel and pulp in the pot, turn to low heat for 40 minutes after the fire is boiled, and boil off excess water.

5. Turn off the fire, then add a proper amount of honey, stir it evenly, put it into a sealed container that is cleaned and dried, and store it in cold storage.