New York Deli-Style Mac 'n Cheese Recipe – Rachael Ray

Ingredients

• 1 pound cavatappi pasta, or any shape you like
• Salt and freshly ground black pepper
• 3 tablespoons butter, plus 1 tablespoon, divided
• 3 tablespoons flour
• 2 cups chicken stock
• 1 cup milk
• 1/4 cup spicy deli mustard
• 3 cups New York aged sharp cheddar (12 ounces), grated
• 1/2 pound deli pastrami, roughly chopped
• 6 slices rye toast, crumbled