INGREDIENTS
1
Bay leaf
1
Garlic clove
3/4 lb
Shallots
2
Thyme, sprigs
2
lbs White onions, sweet
8 cups
Beef broth, low-sodium
1
Black pepper, Freshly ground
3/4 tsp
Kosher salt
1
Baguette, cut into 1/2-inch-thick slices, large
3 tbsp
Butter, unsalted
8 oz
Gruyere cheese