Romaine lettuce is a sturdy, elongated variety of lettuce known for its crisp ribs, firm leaves, and refreshing texture. The outer leaves are typically darker green, while the inner leaves and heart are lighter in color and more tender. Romaine has a clean, mildly sweet, slightly bitter flavor that is more pronounced than iceberg lettuce but less peppery than many bitter greens. Its satisfying crunch and ability to hold up well to dressings and heat make it a versatile ingredient for both raw and cooked preparations.