INGREDIENTS
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1 lb macaroni
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2 1/2 cups milk
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1 cup heavy cream
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4 Tbspn butter, plus more for buttering pan and saute-ing mushrooms
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1 cup onion, finely chopped
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1/4 cup flour
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1/4 lb sharp cheddar, grated
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1/4 lb fontina, grated
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salt
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freshly ground black pepper
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Tabasco or Sriracha (see Tip)
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freshly ground nutmeg
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meat from one ~1.5 lb. steamed lobster, chopped into chunks (see Tip)
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panko bread crumbs
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1/4 lb cave-aged gruyere, grated