2poundsrusset potatoespeeled and cut into 1 ½-inch cubes
1cupwhole buttermilk
2tablespoonsbutter
1teaspoonsaltplus more for cooking potatoes
½teaspoonground white pepper
Instructions
Place the potatoes and salt in a large pot, then add just enough water to cover. Boil on medium-high heat until tender when pierced with a fork, about 15 to 20 minutes depending on the size of the potatoes. Drain in a colander.
Transfer the boiled potatoes to a mixing bowl and mash until mostly smooth.
Warm the buttermilk and butter in the microwave or in a small saucepan over low heat. Do not boil. Pour the mixture over the mashed potatoes and mix to combine.
Season with salt and pepper and serve immediately.