INGREDIENTS
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1/4 cup unsalted butter
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5 medium onions, thinly sliced
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1 bay leaf
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1/2 teaspoon dried thyme
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2 tablespoons dry sherry
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31/2 cups beef stock
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11/2 teaspoons Kosher salt
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1/2 teaspoon black pepper
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8 slices of French bread, toasted
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11/2 cups Gruyere cheese