Ruby (or Ruby Red) grapefruit is a red-fleshed grapefruit variety that arose as a natural mutation on a pink grapefruit tree near McAllen, Texas, in 1929, and became the foundation of the Texas red grapefruit industry. It has a juicy, sweet-tart flavor with characteristic grapefruit bitterness, and its flesh ranges from pink to deep ruby red. It's used in juices, cocktails, and citrus segments, and its acidity and bitterness cut through rich or fatty foods, making it a good match for avocado, seafood, and salads. It also pairs well with mint, basil, cilantro, other citrus, and honey.