2, choose casserole, don't choose iron pot, casserole is more suitable for cooking and stewing. It won't turn apples into iron. Put some pure water, or boil water before putting apples. Note: tap water contains chlorine, just like cooking. It is best not to choose tap water directly.

3, choose 1 piece of old rock sugar, about 30 grams, put it in the pot and I will stew it. Rock candy has the function of removing fire, and it is very sweet. The apple itself is a little sour, just add some rock sugar to remove the acid.

4. After the fire is boiled, turn it into a small fire and stew for about 15 minutes; Then turn off the fire and simmer.