The food materials department of some large supermarkets can buy it. There are also some baking shops. If you really can't buy it, you can use papaya seed powder instead. The production is very simple and the freezing time is super fast. Wipe papaya seeds on the food (liquid) you want to freeze with a quick cloth. Falling powder will freeze the liquid like jelly if it falls into the liquid, so it doesn't need to be put in the refrigerator!

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