INGREDIENTS
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4 large Yukon gold potatoes
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2 yellow onions
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5 sprigs of fresh thyme (+ some for finishing the dish)
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1 cup of grated Gruyere cheese
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3 tablespoons of butter
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3 tablespoons of flour
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2 cups milk
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1/2 tsp. of ground nutmeg (preferably freshly grated)
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1 tsp. salt
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1/2 tsp. black pepper