– 2 teaspoons coarse sea salt – 4 cups (8 ounces) medium or large shell pasta – 4 tablespoons (½ stick) unsalted butter – 1 cup cooked shrimp, rinsed and patted dry – 2 teaspoons spicy brown mustard – 2 tablespoons whole milk – 2 loosely packed cups shredded white cheddar
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