Organic Shells & Real Aged Cheddar Organic Shells & Real Aged Cheddar is for parents who want organic and kids who want orange. Modeled after our original Shells & Real Aged Cheddar, Organic Cheddar Mac (as we call it) is made with certified organic pasta and certified organic Real Aged Cheddar cheese. We color the cheese with annatto, a natural coloring used for centuries to make foods like butter and mustard colored naturally.