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1
Start with the filling: Peel potatoes and roughly chop into 1-inch pieces. Place in a medium-sized pot, cover with water and bring to a boil. Lower heat to a simmer and cook until fork-tender, about 10 to 15 minutes.
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2
While potatoes are cooking, heat 1 tablespoon butter in a saucepan over medium, add the chopped onion and cook until golden brown, about 4 to 5 minutes.
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3
Once potatoes are cooked, drain them and mash until smooth. Add farmer's cheese, onions and 1 pinch each salt and pepper. Mix well, taste, and add more seasonings and cheese if necessary. Set the filling aside while you make the dough.
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4
To make the dough, heat the milk until it's hot but not scalding. In a large mixing bowl, combine the flour, hot milk, sour cream, melted butter, egg yolks, sugar and 1/2 teaspoon salt. Knead until the mixture forms a smooth ball, then cover and let dough rest for 20 minutes. Flour a cutting board or other surface, then use a rolling pin to roll out the dough until it's 1/8-inch thick. Cut circles using a biscuit cutter or a floured glass.
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5
Place about 1 1/2 teaspoons of the potato-cheese filling in the middle of each circle. Wet one half of the circle and then seal the edges together. You can crimp the edges with a fork, or not. If you end up with extra filling, you can serve it the way you would mashed potatoes, or make potato pancakes.
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6
To cook, boil a large pot of salted water. Add in the pierogi, 8 at a time. Once they float to the surface, let them cook for one more minute. Take them out with a slotted spoon and place them on a plate.
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7
If you want to fry them after they are boiled, put an extra tablespoon of butter in a saucepan and cook them for a few minutes on each side until they're golden brown. Serve with sour cream and additional melted butter.
