INGREDIENTS
4 tbsp
/ 1/2 stick unsalted butter
2 tbsp
vegetable oil
4
large sweet yellow onions (sliced thin)
1
loaf of crusty bread of your choice (baguette or ciabatta)
1/4 tsp
salt
1/8 tsp
freshly ground black pepper
1/2 tsp
dried sage
1 cup
dry sherry
3 tbsp
all-purpose flour
6 cups
good beef stock
1
bay leaf
2 cups
gruyere cheese (8 ounces)