In a pitcher, combine pomegranate juice, vodka and ginger beer.
To make ginger rosemary sugar, finely chop a few rosemary leaves.
Grate about 1/4 tsp from a knob of frozen ginger.
Mix ginger and rosemary with a few tablespoons of sugar.
Put on a small plate for rimming glasses.
Wet rims of 4 glasses and rim with ginger rosemary sugar (optional).
Fill glasses with ice.
Pour cocktail mixture into each glass and garnish with pomegranate arils.
Serve immediately. Cheers!