A casserole is also a casserole. After leaving the fire source, it should be placed on the stove or board, not directly in a cold place. If the temperature of the pot is too high, it will crack as soon as it cools down. But if the porridge is cooked before use, it will not leak, and it will take some time to leak after cracking. Therefore, it is best to soak the casserole in rice for two days, and then cook porridge with low fire, so it is not easy to crack and leak.