Sirloin-Apple Stroganoff

My mother made this last Saturday for a family dinner, wherein I was the only person on a Paleo Diet. Everyone loved it, and there were NO leftovers.

12 to 16 oz. of boneless beef sirloin steak, thinly sliced into bite sized strips.
8 oz. of sliced mushrooms
1 bell pepper, chopped
1 large onion, chopped
3 cloves garlic, minced
2 tbsp Butter
4 small apples, halved and cored or 2 large apples quarterd.
1 cup apple cider or juice
8 oz. sour cream
1/4 tsp salt
1/4 tsp ground pepper

1. In large skillet, cook bell pepper, onion, and garlic in hot butter over medium high heat about 8 minutes or until nearly tender. Add meat slices and stir about 4 minutes or until meat is desired doneness. Using slotted spoon or spatula, remove meat and vegetables to serving platter, Cover to keep warm.

2. In same skillet, cook apples, cut side down, in pan drippins about 2 minutes or until browned. Stir in apple cider. Bring to boil; reduce heat. Simmer covered 6 to 8 minutes or until tender. Using slotted spoon or spatula, remove apples from skillet to serving planner, Cover to keep warm.

3. For sauce, whisk sour cream, salt and pepper into pan drippings in skillet until smooth. Spoon sauce over steak and apples and serve.