3 tablespoons butter
1 teaspoon salt
2 tablespoons milk
Place the potatoes in a large pot. Cover the potatoes with water. Bring the water to a boil over medium-high heat. Cook the potatoes until tender enough to pierce with a fork, about 15 minutes; drain and refrigerate potatoes overnight. Peel and grate the potatoes into a large bowl. Melt the butter in a skillet over medium heat; add the grated potatoes; season with salt. Press the potatoes into a round loaf using a spatula. Sprinkle the milk over them. Cover the skillet with a lid. When you hear the potatoes begin to sizzle in about 5 to 10 minutes, reduce the heat to low. Cook until a brown crust has formed on the bottom, about 30 minutes. Cover the skillet with a large plate and flip the Roesti onto the plate to serve. NOTE: This is a simple Swiss side dish. Do not forget to cook the potatoes at least a day beforehand. Do not stir the Roesti because it will be prevented from forming its crust. Add finely chopped, lean bacon, sliced onions, or thinly sliced cheese for other variations.