Find some pebbles in the river, which are about the same size, take them home and wash them repeatedly, rub them with salt and then rinse them clean, and scald them with boiling water 15 minutes before using them. Put the stone in the shade to dry, be sure to dry it! Bought the fish back, washed, boned and sliced, not particularly thin. Boil the stone in hot oil (that's why it must be dried to prevent splashing). When the stone is hot enough (take a piece and put it in a bowl of water, the water will boil, but the amount of water should not be too large), take it out and put it in a container, put vegetables and fish on the stone, and pour in warm water.