Ingredients: 500g watercress, 600g dumpling skin (thick skin), 500g pork stuffing, salad oil, salt, salt and jiaozi vinegar. Wash the watercress, chop it up, put it in a large basin, add 2 teaspoons of salt and marinate for 10 minute. 2. drain the watercress. 3. Pour dehydrated watercress into the meat stuffing. Add 1 teaspoon salt. 7. Add a little salad oil, cook jiaozi, put oil and salt to prevent jiaozi from sticking to the pot. 8. When the pot is boiling, add about half a bowl of cold water for three times in a row, and the jiaozi will be cooked. 9. Drain jiaozi with a colander 10. Dish and pour in jiaozi vinegar.