INGREDIENTS
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1/2 cup low-sodium beef broth
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Pinch of ground nutmeg
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1 teaspoon horseradish (do not drain)
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4 1/2 tablespoons unsalted butter
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2 large onions, thinly sliced
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1 teaspoon chopped fresh thyme
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Kosher salt
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1 8 -inch round loaf sourdough bread
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1 pound gruyere cheese, thinly sliced
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Chopped fresh parsley, for topping