The reason why Luoyang flat stacks are undercooked is that they are too thick or not evenly steamed, so they are not steamed thoroughly. According to relevant information, when making Luoyang flat stacks, spreading them too thickly or not evenly will lead to undercooking. Bianduo is a folk delicacy made of vermicelli and is popular in Luoyang area. Alias: braised pork, vegetarian meat, fake sea cucumber, etc. The method is as follows: cook the sweet potato vermicelli and chop it into pieces, add the sweet potato starch and gravy, add minced onion, ginger, garlic, salt and five-spice powder, then pour in the broth or water, mix well, put it on the basket and spread it into a large piece, about an inch thick. , steam for about half an hour, and the flat stack will be steamed. It is delicious sliced, stewed, fried alone, or made into soup.