Rosemary-Infused Greyhound
WaterSugarFresh RosemaryLarge Grapefruit SeltzerVodka (use the good stuff! Is good vodka an oxymoron?) 
In a saucepan, combine one part water to one part sugar and a large sprig of fresh rosemary. Bring to a boil, stirring until sugar has dissolved. Lower heat and simmer to bring out more rosemary flavor. Squeeze the juice of the grapefruit and strain pulp. In a shaker, combine vodka, grapefruit juice and a rosemary syrup (to taste) with ice. Shake an pour into a glass, top with a splash of seltzer and garnish with fresh rosemary.