Piloncillo is as minimally-processed as you can get your sugar, short of chewing it out of sugar cane yourself. It's the product of cane juice boiled down to a thick, crystalline syrup, usually poured into cone-shaped molds to harden (the name piloncillo derives from "pylon"). What you get is a sugar rife with impurities that puts plain old brown sugar to shame. Modern brown sugar is just purified white sugar with some molasses mixed in. This is the real deal.