INGREDIENTS
1/4 cup
vegetable oil
2 1/2 lb
yellow onions
1 tbsp
brown sugar
1 1/2 tsp
kosher salt
1/4 cup
dry sherry
4 cups
low sodium beef broth
1 tsp
worcestershire sauce
1/4 tsp
ground pepper
1/4 tsp
fresh thyme leaves
1
bay leaf
6 slices
baguette
1 1/4 tsp
dijon mustard
1 cup
gruyere cheese
1 serving
black pepper