INGREDIENTS
1/4 cup
unsalted butter
5 lb
sweet onions
1/4 cup
dry sherry
2 tbsp
balsamic vinegar
1/4 cup
worcestershire sauce
2 tsp
fresh thyme leaves
1 serving
coarse salt
1 1/2 cups
chicken broth
2 cups
gruyere cheese
1 tsp
flat-leaf parsley
1
bread