1, direct heating: put the iron box in hot water for heating, and be careful not to use microwave oven for heating, because microwave oven can't penetrate metal. When heating, make sure that water does not overflow to avoid scalding. After heating, take out the iron box, open the lid, put the grilled fish into the pot, add the right amount of oil, then add the side dishes and seasonings, and stir well.

2. Steamer heating: put the iron box into the steamer, add a proper amount of water, then cover and heat for 5- 10 minutes. After heating, take out the iron box, open the lid, put the grilled fish into the pot, add the right amount of oil, then add the side dishes and seasonings, and stir well.