Lollo Rosso has fringed and crinkled leaves that are tinged deep red at the ends and have a fairly tender, yet crisp texture. It contains the antioxidant quercetin, which is thought to lower the risk of heart disease. Buy it online and get it delivered quickly! Lettuce is high in vitamins A and K. They have a high water content, making them a refreshing choice in hot weather. They also contain calcium, potassium, vitamin C, and folate.