French Onion Soup

4 large, peeled onions
1/4 c. butter
2 tsp sugar
1/4 c. flour
1/2 tsp salt
8 c. beef broth
salt and pepper to taste

Croutons:
8 slices (1-inch thick) French bread 1 c. mozzarella cheese, shredded

Preheat oven to 400 degrees. For soup, slice onions. Melt butter over med heat and add onions and sugar. Sauté 15-18 min, stirring frequently until very tender and golden brown. Stir in flour and salt. Gradually add beef broth and bring to a boil over med-high heat, stirring constantly. Add additional salt and pepper to taste. Cover, simmer over low heat 10 min. For croutons, place bread slices in oven on cookie sheet and bake 5 min until lightly toasted, Grate cheese. Turn bread slices over and sprinkle with cheese. Continue baking 5-8 min or until cheese is lightly browned and melted. Ladle soup into bowls and top with a crouton.