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Ingredients

• 2 ounces  (1/4 cup) unsalted butter, more for the baking sheet
• 4 medium-large  yellow onions (about 2 pound), thinly sliced (8 cups)
•   Kosher salt and freshly ground black pepper
• 1 teaspoon  granulated sugar
• 1 small  baguette (1/2 pound), cut into 1/2-inch slices
• 2 quarts  Roasted Beef Broth or lower-salt canned beef or chicken broth
• 1   bay leaf
• 2 cups  grated Gruyere

Description

This Ultimate Version Of The Bistro Classic Is Made With Homemade Beef Broth And Caramelized Onions. Aged Gruyere Is Key To Getting The Traditional Bubbling Crust Of Cheese; It's Rich, Smooth, And Melts Easily.

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