Here’s a quick recipe for rock candy. In a cooking pot make a hot saturated solution of sugar in water. Start by mixing sugar and water in a 2:1 ratio by volume. Add more sugar or water as necessary to obtain a clear runny syrup. Let cool for 10 minutes. Roll a wet skewer stick or weight (such as a metal nut) attached to a string in some granulated sugar. Pour the warm sugar syrup into a jar. Submerge the skewer or weight in the sugar syrup. For support, consider setting a clothespin or a pencil across the rim. Cover the top and store in a cool place. The longer you wait, the larger the crystals will be.