Pour the mixture into your ice pop molds, leaving a little bit of room at the top for the mixture to expand. Insert sticks and freeze until solid, 4 to 5 hours. Unmold and transfer to plastic bags for storage or serve at once.
Combine the sugar and water in a small saucepan and bring to a simmer over medium-high heat, stirring until the sugar dissolves and the mixture is transparent. Turn off the heat and let cool. Add any spices before the mixture starts to simmer; add any herbs only after you've turned off the heat. Store plain and infused syrups in sealed containers in the fridge.
Makes 1 cup syrup (8 fl oz).
Photograph by Jennifer May