The fruit known for having a rind and commonly used in cocktails is the watermelon. With its thick, green outer skin and sweet, juicy red or yellow flesh, watermelon is not only refreshing and delicious but also hydrating due to its high water content. In cocktails, watermelon juice or pureé is often used to create vibrant and flavorful drinks, making it a popular choice for summer beverages. Additionally, watermelon garnishes can add a fun and festive touch to many cocktails, enhancing both the presentation and taste of the beverage.