1. Cut the grapefruit peel into slices of appropriate size and soak in water for about three days. (Change the water every day while squeezing the grapefruit peel).
2. Put the rock sugar in the pot and put an appropriate amount of water, and heat it to medium-low heat until the rock sugar melts.
3. Stir-fry in the grapefruit peel over medium-low heat.
4. Stir-fry over medium-low heat until the grapefruit peel is transparent.
5. Stir-fry slowly until the water is completely dry, and turn to the lowest heat.
6. Stir-fry over low heat until rock sugar crystallizes. (At this time, be careful not to fry it)
7. Installed, finished!
