Ingredients

• 1/4 cup butter
• 1 1/2 pounds sirloin tip, cut into thin slices
• 1 onion, chopped
• 1 (16 ounce) container sour cream

Instructions

1. Melt butter in a large skillet over medium heat. Add beef and the onions; cook until the meat is browned and the onion tender.
2. Stir in sour cream, and heat through. Do not boil.