INGREDIENTS
4 tbsp
Butter or duck fat, unsalted
1
Bay leaf
4
sprigs Flat-leaf parsley
2
Garlic cloves
6
Onions (about 5 lb.), large
2
Shallots, large
2
sprigs Thyme
8 cups
Chicken or vegetable broth, low-sodium
1
Kosher salt and freshly ground black pepper
1 tbsp
White wine vinegar
8 1/4
slices Bread, country-style toasted
8 oz
Comte cheese or gruyere
1/2 cup
Dry vermouth or dry white wine