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Sweet potato (Ipomoea batatas) is plant from family Convolvulaceae, famous as one of the oldest vegetable. Usually, it's incorrectly mixed with "yam" and "potato". There are about 400 varieties of sweet potato, but white-cream and yellow-orange fleshed are most seen. It is healthy food, mostly because of the high content of vitamin A and antioxidants.
Broccoli is a vegetable from the Italica Cultivar group of Brassicaceae family, family to which also belong cauliflower and cabbage. It is low in calories, but rich in vitamin C, vitamin K, dietary fiber, folate, potassium, selenium, vitamin A, manganese... There are three popular varieties: Calabrese broccoli, sprouting broccoli and purple cauliflower.
Peanut, Arachis hypogaea, is probably created in northwestern Argentina, thousands years ago. Although peanut flowers are above ground, fruits are below ground (peanuts do not grow on trees, neither as a part of root). There are 4 main types: Runner peanuts, Virginia, Spanish and Valencia Peanuts. Peanuts are cholesterol-free and rich in proteins.
Red onion also called purple and Spanish onion is sort of onion with red or purple skin. Although both onions, white and red, have beneficial nutrients, red is richer in antioxidants. Quercetin is the most significant antioxidant from red onion.