Buy it, wash the tripe and boil half a pot of water. Don't touch the tripe. Add water into star anise, pepper, ginger and meat, and add spices to remove the fishy smell of beef. Bought tripe is generally not too bad and needs to be reprocessed. Of course, if you buy a spoiled tripe, you don't need to cook it again. When you are in cook the meat, you can hold the meat with chopsticks until it is cooked. When it is easy to penetrate, you can turn off the fire and drain it for cooling.