Gather sugar, water, a saucepan, a spoon, a baking sheet, and parchment paper
Line the baking sheet with parchment paper
Add sugar and water to the saucepan
Heat the mixture over medium heat, stirring until the sugar dissolves
Stop stirring once the mixture begins to boil
Continue boiling until the syrup reaches hard-crack stage
Remove the saucepan from the heat
Let the syrup cool slightly
Pour or spoon small amounts onto the parchment paper
Allow the candy to harden completely
Break the hardened candy into rock-like pieces
Store the candy rocks in an airtight container