INGREDIENTS
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For the casserole:
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Kosher salt
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1 lb. elbow macaroni
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12 Tbs. unsalted butter
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6 Tbs. all-purpose flour
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1/2 medium onion, thinly
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1 bay leaf
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1 sprig fresh thyme
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9 black peppercorns
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4-1/2 cups milk
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1 tsp. freshly ground black pepper
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Pinch nutmeg
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6 cups (1 lb.) finely shredded sharp Cheddar
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For the topping:
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1-1/4 cups coarse breadcrumbs
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2 Tbs. unsalted butter, melted