2. See if jiaozi is getting bigger. Tangyuan will become very big when it is cooked, but it will remain the same when it is not cooked.
3. Observe whether the glutinous rice balls sink to the bottom. Tangyuan floats when it is cooked, but it is often undercooked when it sinks to the bottom.
4. Open jiaozi directly, so that you can see whether jiaozi is ripe, as long as jiaozi is not white-faced.
5, see the effect of boiling water, boiled water will not exceed jiaozi.
6. Taste it directly, and you will know if it is ripe after tasting one. This is the most direct and simple method.