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Ingredients
- 1/2 pound pork tenderloin
- 1 egg, lightly beaten
- 1/4 cup all-purpose flour
- 1/4 cup butter
- 1/2 cup sliced mushrooms
- 1/2 medium onion, thinly sliced
- 2 tablespoons white wine, optional
- 1-1/2 cups prepared brown gravy
- 2 tablespoons sour cream