INGREDIENTS
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3 Tablespoons unsalted butter, cut into 3 pieces
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6 large yellow onions (about 4 pounds),
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salt
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2 cups water, plus extra for deglazing
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½ cup dry sherry
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6 cups Homemade Beef Broth
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6 sprigs fresh thyme, tied with kitchen twine
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1 bay leaf
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Ground black pepper
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1 small baguette, cut into ½-inch slices
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8 ounces shredded Gruyère cheese (about 2½ cups)