Frozen caipirinha

Cool down with this frozen spin on the classic Brazilian Caipirinha. The secret is squeezing as much lime into the sugar as you can

Cut each of the lime halves into four chunks. Put in a large mortar with the sugar and squish well with a pestle to break them down – they will release their juices, leaving you with a sweet lime syrup. Remove the lime peel, squeeze to release the last bits of juice, then discard. Transfer the lime syrup to a small plastic container and freeze for at least 4 hrs, ideally overnight.
When you’re ready to make the cocktail, put the ice in a blender suitable for crushing ice, then add the frozen syrup and cachaça. Blend at a high speed until smooth and thick. Transfer to cocktail glasses or tumblers and serve immediately.