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Export 10 ingredients for grocery delivery
Step 1
Peel onions and slice 1/8 inch thick, preferably in a food processor.
Step 2
Melt butter in a 6-quart (or larger) stockpot. Add onions; cook, uncovered, over low heat for 1 1/2 hours, stirring occasionally.
Step 3
(The long cooking time makes the onions mellow and sweet.) Stir in pepper, paprika and bay leaf; saute over low heat 10 minutes more, stirring frequently.
Step 4
Pour in 6 cans broth and wine. Increase heat and bring to a boil.
Step 5
Dissolve flour in remaining 1 can broth.
Step 6
Stir into boiling soup.
Step 7
Reduce heat and simmer slowly for 2 hours.
Step 8
Adjust color to a rich brown with caramel coloring, season with salt. Refrigerate overnight. To serve, heat soup in microwave or on stove top.
Step 9
If desired, pour into ovenproof crocks or bowls.
Step 10
Top with a slice of bread and a sprinkling of grated cheese. Heat under the broiler until cheese melts and bubbles, about 5 minutes.
Step 11
Leftover soup can be frozen.