The formula for Dr Pepper is a true mystery—rumor has it that the company even stores the recipe in a limited access vault in Plano, Texas.[1] For years, however, curious fans have attempted to duplicate the taste of this popular soda at home. You can try simply adding a couple of flavor extracts to regular cola, or brew up a multi-ingredient concoction from scratch. Try a few different recipes and see what your taste buds think!