The bottom of the iron pot is white because the vegetable oil on the surface of the iron pot is brushed off during cleaning and has nothing to do with steaming fish. There is usually a layer of vegetable oil on the surface of the iron pot, and because of frequent use, there is also solidified cooking oil on the surface. When this layer of oil is cleaned off, the color of the pan itself will be exposed, so it is off-white.

Clean the pot, put the oil to burn three or four layers of heat, under the appropriate amount of a fish put 1 to 2 tablespoons of flour on the line to stir quickly, while stirring the side of the pour into the _ soup, the water can also be, in turn, into the boil over the water of the fish, green onion segments, ginger slices, dry red chili peppers, slow steaming on a low flame.