Raw shepherd's purse is bitter. When we are cooking, shepherd's purse will be bitter as long as it is not cooked, but bitterness can help us to get rid of internal heat, so if we want to be bitter, we need to fry shepherd's purse. Mustard has several names, namely, bitter mustard and bitter root vegetables. It belongs to the genus Euphorbia in Cruciferae, and contains high nutritional value, rich in vitamins, calcium, carbohydrates and other nutrients. We can cook it directly. It tastes bitter. After eating it, it is of great benefit to our health, which can help us diuresis and excrete toxins in time.