INGREDIENTS
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1/2 cup unsalted butter
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4 onions, sliced
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2 garlic cloves, chopped
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2 bay leaves
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2 fresh thyme sprigs
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Kosher salt and freshly ground black pepper
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1 cup red wine, about 1/2 bottle
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3 heaping tablespoons all-purpose flour
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2 quarts beef broth
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1 baguette, sliced
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1/2 pound grated Gruyere