2. Before cooking mutton, you can cut the fresh mutton you bought into small pieces and put it in a small basin to remove blood. It is best to change the water in the small basin in time until the water in the basin is completely clean, which proves that the blood has been removed. When the sheep is slaughtered, the blood will condense in the meat, and if the blood is not removed when the mutton is cooked, it will smell like fish. When everything is ready, heat the fire until the water boils and bring the pot to a boil. When you find a lot of dark red foam floating on the water, rinse it with a spoon, then add onion and ginger, cover the pot and continue to cook for about 40 minutes. Poke meat with chopsticks. If chopsticks can be poked in, it means that the meat is cooked, take it out to dry, and then you can make cold salad or mutton soup.