Sea urchin is distilled water, but it is broken. Sea urchin is an invertebrate living in shallow water. Sea urchins contain autolytic enzymes. Once the sea urchin is opened for a long time, the bile yellow will soften or even liquefy, deteriorate rapidly and produce a large number of bacteria. After cooking, it is proved that the sea urchin is liquefied and deteriorated, so the sea urchin is broken after cooking.