INGREDIENTS
2
White onions, large
4 cups
Beef stock, homemade or low-sodium canned
4 cups
Chicken stock, homemade or low-sodium canned
3 tbsp
All-purpose flour
1/4 tsp
Pepper, freshly ground
1 tsp
Salt
18
thin slices French baguette
1/2 cup
Butter, unsalted
2 cups
Swiss cheese