1 cup of sugar
1 cup of water
1 teaspoon of grapefruit zest
2 cups of freshly-squeezed ruby red grapefruit juice
2 tablespoons of freshly-squeezed lemon juice
1. Add the sugar, water, and grapefruit zest to a medium saucepan. Bring to a boil over medium-high heat, stirring until the sugar dissolves. Remove from the burner and set aside for a few minutes.
2. Stir in the grapefruit and lemon juice. Strain through a fine-mesh sieve. Let cool.
3. Divide the mixture among popsicle molds and freeze for at least four hours, or until solid.