French Beef au Gratin

1/2 cup butter
4 cups thinly sliced white onions
1 lb. beef tenderloin cut into 1/2" cubes
3 Tbs. flour
1 Tbs. dark brown sugar
1 tsp. cumin
1 tsp. salt
1/2 tsp. pepper
1 qt. beef broth
2 cups cooked fettuccine
1 cup shredded mozzarella cheese
1/2 cup grated parmesan cheese

In large pan over medium heat, melt butter. Add onions and sauté until caramelized, 15-20 minutes. Remove onions and add beef. Brown well on all sides. Add onions. In small bowl, mix flour, sugar, cumin, salt and pepper. Add to pan, stir 1 minute until bubbly. Gradually add broth, scraping up drippings, and simmer 10 minutes. Heat broiler. Place 1/2 cup fettuccine in each of 4 (about 16 oz.) ovenproof bowls. Divide beef mixture over pasta. Stir cheeses together. Sprinkle evenly over beef. Broil until cheese is melted and lightly browned, about 5 minutes. Makes 4 servings.

Credit: Reader's Digest