Have you head of arugula?
It is a green, leafy vegetable that has more nutrients (such as beta-carotene and Vitamin C) than iceberg lettuce. It also has about nine times more calcium.
When making salads remember to choose a variety of leafy greens, such as arugula, romaine, and chicory. Using these greens in salads and on sandwiches gives you more nutrition. And, remember to always wash produce before eating.