INGREDIENTS
3 tbsp
butter
1
small yellow onion (, halved lengthwise, then thinly sliced)
1 clove
garlic (, chopped)
1/2 tsp
dried thyme
1/4 tsp
kosher salt
1/8 tsp
freshly ground black pepper
1/4 cup
red wine
1 tbsp
all-purpose flour
2 cups
chicken broth
1
thick slice French bread
1/4 cup
shredded Gruyere cheese