Rosemary Ruby Cocktail
Bring 1 cup water, the sugar and 6 rosemary sprigs to a boil in a saucepan.
Let cool; discard the rosemary.
Combine grapefruit juice, vodka, bitters and 3/4 cup rosemary-sugar syrup in a pitcher.
Pour into 6 rocks glasses filled with ice cubes.
Garnish each with a rosemary sprig.