3. Stir-fry the rock sugar continuously after the middle fire, so that the sugar can melt quickly. Turn down the fire as soon as you see the crystal sugar melt, and don't get burnt by the fire.
4. Turn off the fire and continue to stir fry. Large bubbles appear first in the process of stir-frying, and small bubbles appear after continuous stir-frying.
5. When there are small bubbles, the pot is already brownish red. At this time, immediately pour in hot water and stir well with a spoon.
6. Then turn to high heat, cook for a few seconds, and stir the water and sugar in the pot evenly.
7. naturally cool after turning off the fire, put the sugar color in a well-sealed container, cover it, and put it in the refrigerator for direct use when adding color to the ingredients.