生菜, known as "lettuce" in English, is a leafy green vegetable commonly used in salads and sandwiches. It belongs to the Asteraceae family and is known for its crisp texture and mild flavor. There are several varieties of 生菜, including romaine, iceberg, and butterhead, each with unique characteristics. This vegetable is low in calories and high in water content, making it a popular choice for healthy diets. 生菜 is also a good source of vitamins A and K, as well as folate. It can be eaten raw or cooked, but is most often enjoyed fresh in salads.