Heat water and bring to a boil. Remove from heat. Add dried hibiscus and let steep for 15 minutes. Remove hibiscus. Add sugar and stir until dissolved. Syrup should coat the back of a spoon. Set aside.

Place sugar and dried hibiscus in a shallow bowl. Stir to evenly distribute. Run a lime wedge on the rim of your cosmopolitan glasses. Dip rim of glasses on hibiscus/sugar mixture. Set aside. 

Place vodka, orange liqueur, hibiscus syrup, lime juice and ice in a cocktail shaker. Shake vigorously for 30 seconds. Pour into prepared cocktail glasses. Garnish with a pinch of hibiscus, a lime wedge and serve.