Grapefruit is a citrus fruit known for its tart and tangy flavor, with a subtle sweetness that can vary depending on the variety. In the context of alcohol and cocktails, grapefruit juice or slices are often used to add a refreshing and slightly bitter element. Grapefruit pairs well with a wide range of spirits, including vodka, gin, tequila, and rum. It is a key component in classic cocktails like the Paloma, Greyhound, and Sea Breeze. The bright acidity and bitterness of grapefruit can balance out the sweetness of other ingredients, making it a popular choice for creating well-rounded and vibrant drinks.