French Onion Soup
["6 c. (1 1/2 lb.) onions, thinly sliced", "1/4 c. butter or margarine", "3 (10 1/2 oz.) cans condensed beef broth", "1 tsp. Worcestershire sauce", "1/4 tsp. salt", "6 to 8 slices French bread (toasted)", "6 to 8 slices Swiss cheese", "grated Parmesan cheese"]
["In a covered 3 quart saucepan cook sliced onions in butter until tender, about 20 minutes.", "Add beef broth, Worcestershire sauce, salt and dash of pepper.", "Bring to boiling."]
["onions", "butter", "condensed beef broth", "Worcestershire sauce", "salt", "bread", "Swiss cheese", "Parmesan cheese"]