For one Grapefruit Rosemary Sparkler, gather these items:
- 2 oz fresh grapefruit juice
- 1 oz vodka
- 1/2 oz simple syrup
- 1 sprig fresh rosemary
- 2-3 oz sparkling wine or prosecco
- Ice cubes
- Grapefruit slice for garnish
Fresh grapefruit juice is key for the best flavor. If needed, bottled juice can work too. The simple syrup adds sweetness, balancing the tart grapefruit.