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French Onion Soup
Ingredients
1/2  pound  firm white onions, sliced
1/4  cup  butter
2 tablespoons corn oil
3 tablespoons flour
1 quart chicken broth
1 quart beef broth
8 slices French bread
Swiss cheese, shredded
Parmesan cheese, grated [preferably Reggiano]

Method
Saute onions in butter and oil until onions are transparent, but not
well-browned. When tender, turn heat to lowest point and sprinkle with
flour, stirring vigorously. Pour into Dutch oven and stir in broths.
Heat thoroughly and divide among 8 oven-proof bowls. Mix equal parts of
cheeses to smooth paste and spread over bread. Float a slice of
bread atop each serving. Place all bowls on oven rack 4" from broiler heat
and broil until cheese  melts. Serve at once.