Practice: dissolve yeast powder in warm water, put a spoonful of sugar and an egg in flour, knead into dough and ferment. Roll the dough into pancakes, roll it up and fork a small hole. Brush the cake plate with oil, put the pastry on it, brush a layer of tomato sauce, and then spread the fried beef, chicken, onion rings, green and red pepper rings and diced carrots in turn.