1. Dice the purple potato and steam for 25 minutes
2. Add 1 tablespoon of sugar, add 350ml of hot water to the bowl
3. Slowly add milk pudding powder, and while using a whisk
4. Lay the purple potato diced on the bottom
5. Add the patch that has been opened, it’s better to have no purple sweet potatoes just now
6. Add another layer of purple sweet potato
7. Spread another layer of patch liquid and repeat the steps until the container is full
8. Let it cool and it's ok
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