In a large stockpot on medium-high heat, saute the onions with the butter and bay leaf for 20 minutes, until the onions turn a rich golden brown color. Deglaze the pan with the sherry and brandy and simmer uncovered for 5 minutes. Add the white wine and simmer uncovered for 15 more minutes.
Add the beef and veal stocks plus salt and pepper. Bring to a boil, then simmer uncovered for 20 minutes. Remove the bay leaf, taste for salt and pepper, and serve hot with grated Parmesan (optional place in crock add slice of baguette, cover with swiss/gruyere and quickly place in broiler till melted and bubbly).
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