The practice of canned crystal sugar loquat, how to make canned crystal sugar loquat delicious?

Loquat is peeled and seeded, put in a jar, and a layer of loquat is put with a layer of rock sugar. Then put it in cold water and steam it in a pot. Put the lid of the jar gently on the jar, don't twist it. After steaming for half an hour, tighten the bottle cap with a rag (the bottle cap cannot leave the can bottle during this period). After tightening, take out the cans and let them cool naturally. Due to the air pressure, the bottle cap will sink. Sinking cans can be kept in the refrigerator for a month. If there is no invagination, it will fail and need to be eaten as soon as possible.