French Onion Soup

Ingredients

• 3 tablespoons unsalted butter cut Into 3 pieces
• 6 large yellow onions (about 4 pounds), halved and
• cut pole to pole into 1/4-inch-thick slices
• Salt
• 2 cups water plus extra for deglazing
• 1/2 cup dry sherry
• 4 cups low-sodium chicken broth
• 2 cups beef broth
• 6 sprigs fresh thyme tied with kitchen twine 1 bay leaf
• Ground black pepper
• CHEESE CROUTONS
• 1 small baguette cut on bias Into 1/2-inch slices
• 8 ounces Gruy�re cheese shredded (about 21/2 cups)