Stealthy Pinkerton agents have nothing on this genuine gem of an avocado. Pinkerton avocados are rarely seen in the supermarket (because of their odd shape). Long with a small seed—you can get a lot of avocado value out of them. It turns black as it ripens. Avocados are a healthy substitute for foods rich in saturated fats, like butter and fatty meats. Smear mashed avocado on bagels, toast or rice cakes—scrumptious!