Beef Stroganoff

Ingredients
1-2 pounds beef tenderloin
1/2 teaspoon salt
1/2 teaspoon ground black pepper
4 ounces butter
1/2 cup onions, diced
4 tablespoons all-purpose flour
1 (10.5 ounce) can condensed beef broth
1 teaspoon powedered mustard
1 package sliced mushrooms
1/3 cup sour cream
1/3 cup white wine
salt to taste
ground black pepper to taste
1 package wide egg noodles

Directions
1.  Cut beef into strips 1/2 inch thick by 2 inches long.  Remove silver lining. Season with 1/2 teaspoon of both salt and pepper.
2.  In a large skillet over medium heat, melt the butter, add onions and mushrooms. Add the beef strips.
3.  Stir the flour into the juices on the empty side of the pan. Pour in beef broth and bring to a boil, stirring constantly. Lower the heat and stir in mustard.
4.  Simmer to reduce sauce and cook off wine for about 15 minutes.
5.  Stir in sour cream. Add salt and pepper to taste.  Serve immediatley over noodles.