A colourful, refreshing cocktail.
Peel the two limes and squeeze the juice out of one of them.
Mix gin and Cointreau and pour into 4 glasses.
Add ice, lime peel, lime juice and pomegranate arils.
Top with sparkling water and garnish with the rosemary sprigs.
If you can get frozen pomegranate arils they are ideal as they not only help keep the drink cool, but there will be less mess to clear up!