1. Preparation materials: one pound of potatoes, 3g of butter, 50g of milk, appropriate amount of salt, 5g of butter, 3 tablespoons of oil, 80g of water, 3g of starch, appropriate amount of peppercorns.

2. Peel the potatoes, wash them, cut them into pieces, and put them on a plate. Pour water into the steamer, put the potatoes in and steam them over high heat.

3. After steaming, mash the potatoes into a paste and add an appropriate amount of salt.

4. Mash it and add salt to taste. Add 50g of milk and continue to mash it.

5. Put 30g of butter in the hot pan.

6. After the butter melts, add mashed potatoes, stir-fry evenly over low heat and put on a plate.

7. Take another pot, add 5g of butter, three tablespoons of oil, and water starch and stir evenly.

8. Stir until the soup is thick and then turn off the heat.