Ingredients: potatoes; milk; salt; pepper; stock (that is, chicken or duck stock), low gluten flour Production process: 1. Chop the potatoes and steam them soft, and then grind them into a puree when cool. 2. Heat the butter in a pan, add the mashed potatoes, milk and salt, and sauté until thickened. 3. 3. Put the mashed potatoes into a container and set aside. 4. In a saucepan, add butter, a little low-gluten flour, a little milk, stock, pepper, salt, etc. Bring to a boil, then reduce to a paste and pour over the mashed potatoes.