Ingredients: grapefruit 1 (round, not cyan), honey (it is best to use honey with light fragrance, which can highlight the fruity taste of grapefruit, and the dosage is about half of the weight of grapefruit), and half a pack of rock sugar. Practice: 1. First, wash the grapefruit skin, scrub the grapefruit skin with salt and rinse it off. You can use a toothbrush dipped in salt. 2. Peel off the skin of grapefruit with a knife. Be sure to cut it carefully. Try to cut only the yellow part, and the white part can be selected according to your own taste. The first layer of grapefruit is grapefruit skin, which is the essence of resolving phlegm and relieving cough, and then the white pulp between grapefruit skin and grapefruit pulp, which is the most bitter place of grapefruit and can be chosen according to your own taste. 3. Rub the grapefruit skin with salt to separate out the bitter taste in the grapefruit skin, and then rinse it with clear water. This step can be repeated two or three times. 4. Soak grapefruit peel in clean water and add some salt to help remove bitterness. The soaking time needs to be longer, and it can be soaked for one night. Then peel the grapefruit meat and shred it. If there is a blender, it can be crushed with a blender. 5. Boil pomelo peel with clear water 10 minutes or so, and add some salt when cooking, which can also remove the bitterness. Finally, rinse the pomelo peel with clear water and drain the water. 6. Put the cut pomelo peel and pulp mud into a clean and oil-free pot, add a small bowl of water and rock sugar, and cook for 1-2 hours with medium and small fire until the pomelo peel is thick and golden. Pay attention to stirring frequently when cooking to avoid sticking to the pot. Cooling, adding honey, and stirring to obtain honey grapefruit tea. Then put it in a sealed container and put it in a refrigerator for cold storage. It can be eaten after 3 days. After shredding and pickling, the bitter taste of grapefruit peel has been much less, and it will be lighter after boiling. After standing, the longer the time, the lighter the bitterness. If you like sweets, you can put more rock sugar or honey; If you like the bitter taste of grapefruit, you can peel it thicker (in fact, it will be better to be bitter). Take whatever you want. When you want to drink, dig 2~3 spoonfuls of citron tea, then pour in some warm water and stir well. It can also be eaten as jam.