Ramune Concentrate (Lemon-Lime)

Combine granulated sugar and filtered water in a medium saucepan. Heat over medium heat, stirring constantly until the granulated sugar is completely dissolved and the mixture is clear. Do not allow the mixture to boil vigorously.

Remove the simple syrup from heat and allow it to cool completely to room temperature. For faster cooling, place the saucepan in an ice bath.

Once the simple syrup is thoroughly chilled, transfer it to a clean, airtight bottle or container. Add citric acid powder, natural lemon extract, and natural lime extract.