Add the sugar and water into a pot and heat the ingredients until dissolved.
Stir the mixture over medium heat until the liquid is completely clear, not cloudy.
Immediately remove from the heat source.
Add the rind of the pummelo to the pan along with the sugar and water.
Once the mixture is cool, remove the pummelo rind.
Store your simple syrup in an airtight container, in the refrigerator, until ready to use.
Cheers!