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Ingredients:
5lb yellow-fleshed potatoes such as Yukon Gold (peeled and cut into 1 inch pieces)
1 tbsp salt
1 cup whole milk
1/2 cup sour cream
1 1/2 sticks unsalted butter (3/4 cup)
2 bunches scallions, cut crosswise into 1/2 inch pieces
1/2 teaspoon black pepper
-Cover potatoes with cold water by 2 inches into a 5-6 quart pot and add 1 1/2 tsp salt.
-Bring to boil, then reduce heat and simmer, uncovered until potatoes are tender (10-15 minutes)
-Drain potatoes in colander, then return to pot and cook over medium heat, shaking pot occasionally, until dry, 1-2 minutes. Mash hot potatoes with masher or force through food mill into another pot (keep warm)
-Bring milk with remaining 1/1/2 teaspoon salt just to a boil in a 1 quart saucepan, then remove from heat and stir into potatoes until combined.
-Stir in sour cream, then cover and keep warm
Yields 8-10 servings