1. Ingredients: 100 grams of rock sugar, lemon juice, 50 grams of cold boiled water, and 50 grams of boiled water.

2. Method: Heat 100 grams of rock sugar in a microwave oven for about 20 seconds and break it into small pieces.

3. Add 50 grams of crushed rock sugar to a boil, put it into a small pot with a thick bottom and heat over low heat until the sugar is completely melted. Stir continuously during this period, and add the lemon juice of half a lemon.

4. When all the sugar is melted, add 50 grams of boiling water and stir continuously. When the bubbles become smaller and the color turns slightly yellow, you can turn off the heat and the syrup will be ready.