I don't know what is written on some recipes. So I developed a formula.
Step1:1. Add water to the pot. Boil the potatoes in the pot. 2. Peel the potatoes. Put them in a bowl and press into the mud. Add salt and milk and mix well. Knead into a ball and place in a bowl. 3. Put water, soy sauce, butter and black pepper into the pot and cook until the butter melts. (make sure to cook and stir well) 4. Turn on the fire. Pour the wet starch into the pot and stir well. Cook until sticky. 5. Pour the cooked sauce into the bowl filled with mashed potatoes. Decorate. You can eat it.
Cooking tips:1. Wet starch is starch water = 1-1. Mix it. 2. When cooking the sauce, make sure to open a big fire. Always stir. There are skills in making delicious dishes.