Add the raspberries, water, and sugar to a medium saucepan.
Stirring occasionally, bring to a simmer over medium heat. Simmer for 1-2 minutes, or until the raspberries disintegrate into mostly seeds and mush. Remove from heat.
Strain the raspberry pulp from the liquid, discarding the pulp and reserving the liquid. Allow the syrup to cool at room temperature for 15 minutes.
After cooling time, transfer the syrup to a syrup bottle or mason jar with a lid and store in the fridge for up to 2 weeks.