Cubes of sirloin steak in a savory sauce of caramelized onions on a bed of fettuccine, topped with mozzarella and Parmesan cheeses and broiled until cheese is melted and slightly browned.

French Beef au Gratin

8 ounces fettuccine, cooked according to package directions
1/2 cup butter or margarine
4 cups sliced white onions
1 pound sirloin steak, cut into 1/2-inch cubes
3 tablespoons all-purpose flour
1 teaspoon salt
1/2 teaspoon ground black pepper
4 cups beef broth
1 cup shredded mozzarella cheese
1/2 cup freshly grated Parmesan cheese

1. In a large skillet melt butter over low heat and saute thinly sliced white onions until golden, about 30 minutes. Remove the onions.
2. To the skillet add sirloin steak cubes. Brown well then return the onions to the pan.
3. In a small bowl combine flour, salt, and pepper. Add to the skillet and stir until blended. Gradually add beef broth and cook for 10 minutes.
4. Pour over the cooked fettuccine and top with mozzarella cheese and Parmesan cheese. Broil until the cheese is melted and slightly browned, about 5 minutes.

Makes 4 servings.