Prepare the Equipment: Line a baking sheet with parchment paper and set aside.
Heat the Syrup: In a heavy-bottomed pot, combine sugar, corn syrup, and water. Heat over medium-high, stirring occasionally.
Check Temperature: Attach the candy thermometer to the pot and bring the mixture to a boil. Let it cook until it reaches 300°F-310°F (Hard Crack Stage).
Add Flavor & Color: Once the syrup reaches the hard crack stage, remove it from the heat. Quickly stir in the flavoring oil and food coloring (if desired).
Pour & Cool: Pour the hot syrup onto the prepared baking sheet, spreading it evenly. Let it cool and harden for about 30 minutes before breaking it into pieces.