Butter lettuce, also known as Boston lettuce or Bibb lettuce, is a type of leafy green vegetable characterized by its soft, tender leaves and a mild, slightly sweet flavor. The leaves are usually light green and have a smooth, buttery texture, making them a popular choice for salads and sandwiches. This lettuce variety grows in a loose, round head and is often used in gourmet dishes due to its delicate nature. It is rich in vitamins A and K, as well as folate, making it a nutritious addition to meals. Butter lettuce is best enjoyed fresh, as cooking can diminish its texture and flavor.