Not as sweet as regular granulated sugar, rock sugar comes in the form of amber-colored crystals, the result of sugar cooked until it begins to color. It's used to sweeten certain Chinese teas and meat glazes. See also sugar.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.