- 4 large russet potatoes
- 1 teaspoon salt
- 3 tablespoons butter
- 1/2 cup milk, plus more if needed, warmed
- 2 tablespoons sour cream
- Salt and freshly ground pepper
Peel the potatoes, cut in half, and place in a pan, then cover with cold salted water. Bring to a boil and continue cooking until the potatoes fall off the fork when pierced, about 20 minutes. Drain the potatoes. Gently press the potatoes through a sieve (or potato ricer) into a large bowl, using a rubber spatula.