In a large stockpot on medium-high heat, saute the onions with the butter and bay leaf for 20 minutes until the onions turn golden brown
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 veal and beef stock, salt and pepper, bring to a boil then simmer uncovered for 20 minutes
Remove the bay leaf, add a little more salt if needed and serve with Parmesan toast:
Slice a baquette on the diagonal, brush with olive oil, sprinkle with grated Parmesan cheese, salt and pepper – bake for 15 to 20 minutes or until browned