The leftover soybean dregs after oil extraction by enterprises can be transformed into soybean protein by dissolving and precipitating the protein using methods such as adding salt and alkali, removing the cellulose from the waste residue. Soybean protein is derived from the waste produced during the oil extraction process, and it is extremely cheap. When mixed with water, it has a taste very similar to minced meat. All the inexpensive frozen dumplings available on the market are made using this.