1. Combine ginger and water in a small saucepan and bring to a boil over high heat. Remove from heat, cover and let steep for 20 minutes.

2. Pour the ginger and water into a clean jar. Add the vinegar and honey, and stir until the honey is completely dissolved. Cover and refrigerate until cool, at least 1 hour.

3. To serve, combine ½ cup strained ginger vinegar mix with ¼ cup grapefruit juice and ¼ cup sparkling water. Add ice if desired and enjoy!