Ingredients
- 1 pound beef; use good-quality steak for best results, but ground beef also works
- 2-3 medium yellow onions, diced
- cooking oil or butter
- 1 bell pepper, diced
- 6-8 ounces mushrooms, sliced, or 1 can
- 12 ounces sour cream
- 2 tablespoons worcestershire sauce
- 1 cup cooking wine
- 1 teaspoon ground mustard
- salt and pepper
- 1 tablespoon cornstarch, optional
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