A watermelon daiquiri is a bright, icy cocktail made by blitzing frozen watermelon with rum, fresh lime juice and a little sugar or simple syrup, pureeing with ice to create a refreshingly slushy texture. It’s a brilliant summer sipper because watermelon’s high water content and natural sweetness yield a light, hydrating drink that balances perfectly with tart lime and spirited rum, while the slushie consistency keeps you cool, feels fun and festive, and makes it easy to sip poolside, at barbecues or any scorcher of a day.