Lettuce is eaten fresh and is commonly served as the base of green salads. Lettuce is generally a rich source of vitamins K and A, though the nutritional quality varies, depending on the variety.
Spinach is served as a salad green and as a cooked vegetable. Spinach leaves contain oxalates, which are associated with the formation of kidney stones if consumed in excess over time; steaming or boiling spinach...
Labelled as a vegetable for nutritional purposes, tomatoes are a good source of vitamin C and the phytochemical lycopene. The fruits are commonly eaten raw in salads, served as a cooked vegetable, used as an...