INGREDIENTS
4 lb
yellow onions, peeled and chopped
10 cups
beef broth
1
baguette, sliced diagonally and toasted
1
bay leaf
1 1/2 cups
Gruyere or swiss cheese, grated or sliced
1/2 cup
unsalted butter, melted
1/4 cup
all-purpose flour
2 tbsp
extra-virgin olive oil
2 tbsp
balsamic vinegar
1 tbsp
Worcestershire sauce
kosher salt and freshly ground pepper,
Minced chives, for garnish