Slice dragon fruit into large chunks. Add to a medium saucepan.
Add sugar and water to the saucepan.
Heat over medium heat, stirring occasionally until sugar is melted and the syrup is hot. Be careful not to burn the syrup.
Remove from heat, smash the dragon fruit, and allow the syrup to cool.
After at least 6 hours of resting, remove the dragon fruit pieces and strain the syrup into a mason jar.
Dragon fruit simple syrup can be stored in the fridge for 2-3 weeks.