Get the recipe for Sauerkraut Filling for Pierogi.
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To freeze pierogies: grease a baking dish with melted butter and top with chopped onions. Layer cooked pierogies in the dish, adding more melted butter and onions in between layers. When cool, divide into freezer bags; the butter will keep the pierogies from sticking, and when you thaw them, the contents of the bag can be placed in a skillet for easy reheating.