Newcastle Beef

16 ounces sirloin steak
1 tablespoon vegetable oil
2 tablespoons butter
1 medium onion, sliced
6 button mushrooms, sliced
12 ounces Newcastle dark ale or other
1/2 cup low-fat sour cream
salt and pepper

1. Melt butter in a large skillet over medium heat and add the onion. Cover and allow to caramelize until fully browned, about half an hour.
2. Remove the onions from the skillet and add the vegetable oil. Fry steak in batches until browned on all sides.
3. Readd the onions, add the mushrooms and pour ale over to cover.
4. Reduce heat to a simmer and cook until beef is softened and can easily be torn apart with a fork, about an hour.
5. Remove from heat, season with salt and pepper to taste and stir in sour cream to serve.

Makes 4 servings