Sauerkraut Pierogi Filling - cooking recipe

Ingredients
    16 ounces sauerkraut
    1/2 cup butter
    1 onion, chopped
    1 cup chopped mushrooms (optional)
    salt and ground black pepper to taste
Preparation
    Grind sauerkraut in a food processor. Transfer to a skillet; cook and stir over medium heat until softened, about 10 minutes. Drain in a colander.
    Heat butter in skillet over medium heat; stir in onion and mushrooms. Cook and stir until onion has softened and turned translucent, about 10 minutes.
    Combine sauerkraut with onion mixture, add salt and pepper, and cook for 2 minutes. Spread onto plate to cool completely.

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