INGREDIENTS
1/2 cup
butter
8
onions, sliced
2 cloves
garlic, crushed
1/2 tsp
salt, or to taste
1/2 tsp
ground black pepper, or to taste
1 tsp
dried thyme
1 cup
red wine
1 tbsp
sherry
2 tbsp
all-purpose flour
2 qt
beef broth
1
French baguette, cut into 1/2-inch thick slices
olive oil, or as needed
6
slices Swiss cheese
6
slices provolone cheese