Yield: 1 serving

¼ cup crushed ice
1 tablespoon fresh rosemary
1 (¼-inch-thick) slice grapefruit
1½ ounces vodka
4 ounces seltzer water
Garnish: grapefruit slices and rosemary sprigs
1. In a cocktail shaker, muddle together ice and rosemary. Add grapefruit slice, and muddle again.

2. Pour vodka and seltzer water over muddled grapefruit mixture. Strain into a glass. Serve with ice, if desired. Garnish with a grapefruit slice and a rosemary sprig, if desired.