Piloncillo is unrefined Mexican dark brown sugar sold in solid cone shapes with flattened tops. Sizes range from under an ounce to more than half a pound. At Dos Caminos, our piloncillo cones weigh 6 ounces apiece. While firmer in texture than American brown sugar, the two can be used interchangeably. However, piloncillo must be chopped with a serrated knife or grated before using.