French Onion Soup
["2 Tbsp. margarine", "3 onions, sliced", "3 (10 1/2 oz.) cans beef broth", "6 to 8 slices French bread, toasted", "Swiss cheese"]
["This may be mixed in a 3-quart covered bowl or in individual bowls.", "Serves 6 to 8."]
["margarine", "onions", "beef broth", "bread", "Swiss cheese"]