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Slice onions, 1/8 inch thick. Melt butter, place onions in it, saut slowly for 1 1/2 hours in a large soup pot. Add all other ingredients except bouillon, wine and salt, saut over low heat 10 minutes more. Add bouillon and wine and simmer 2 hours. Adjust color to a brown with caramel coloring or liquid browning sauce. Season to taste with salt. Put in refrigerator overnight. To serve - Heat soup. Fill oven-proof casserole or individual oven proof bowls with 1 cup soup, top with 3 one-half inch slices of French Bread and top with a slice of imported swiss cheese (Gruyere preferred). Place under broiler to brown, approximately 5 minutes at 550 degrees F.
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