The filling is placed in the middle and the dough folded over to form a half circle or rectangle or triangle if the dough is cut squarely. The seams are pressed together to seal the pierogi so that the filling will remain inside when it is cooked. The pierogi are simmered until they float, drained, and then sometimes fried or baked in butter before serving or fried as leftovers. They can be served with melted butter or sour cream, or garnished with small pieces of fried bacon, onions, and mushrooms.Bacon, cheese, onion and mushroom topping for fried pierogi from urbancookingguide.com Dessert varieties may be topped with apple sauce, jam, or varenye.
