1. Take out the custard bag and thaw it for later
2. Put it in a warm environment until the custard bag softens slightly
3. Put the slightly thawed custard buns on top of the steamer and steam them on high heat for five minutes
4. Take out the custard buns from the basket and put them on a plate to cool slightly
5. You can use chopsticks to open it to see if this custard bag is mature
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