Rock Candy Syrup This page first published: May 6, 2006 · Updated: Jun 5, 2018 · by CooksInfo. Copyright © 2021 · This web site may contain affiliate links · This web site generates income via ads · Information on this site is copyrighted. Taking whole pages for your website is theft and will be DCMA'd. See re-use information. Rock Candy Syrup is a sweeter, thicker version of simple syrup. It’s made from 2 parts sugar, 1 part water, brought to a boil, lowered to a simmer and simmered for 5 minutes, then removed from the heat and allowed to cool.