Use this recipe when making our Passion-Fruit Orangeade.
Prepare an ice bath. In a large saucepan, combine sugar and water; bring to a boil over medium-high heat. Cook until the sugar has completely dissolved, about 10 minutes. Transfer syrup to a bowl, and set bowl over ice bath. Let stand, stirring occasionally, until chilled. Store the syrup in an airtight container, refrigerated, up to 2 months.