After the fire boils, continue to simmer for about 20 minutes. The following is the practice of waxy corn syrup: main ingredient: waxy corn 300g auxiliary material: appropriate amount of rock sugar Step 1: Prepare fresh waxy corn. Step 2: Peel the waxy corn into granules. Step 3: Prepare rock sugar. Step 4: Wash the corn kernels, put them in a pressure cooker, add a proper amount of rock sugar, boil them on high fire and stew them on low fire for about 20 minutes. Step 5: serve glutinous corn crystal sugar water.