2. Wash, cut and fry the prepared vegetables for later use. Break an egg and cut it into strips for later use. Then coat a layer of oil on the surface of the dumpling skin, and pile all the unfinished rubber skins on the coated dumpling skin, about ten in a pile. Then roll these dumpling skins thin with a rolling pin, roll them into a thin layer and steam them in a steamer. Finally, the steamed dumpling skin looks very transparent. Gently peel off the dumpling skin and wrap the prepared vegetables, and the delicious spring cake will be ready.