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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.
Celery is a vegetable from the family Apiaceae which exists since antique times. In America is mostly used celery stalk, but in Europe hypocotyl of the plant, called celery root. It can prevent inflammation and dehydration, like many other diseases. It protects kidney and pancreas, but it can also cause an allergy.
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.
During its long travel though history of mankind, onions managed to heavily influence our development, spreading across the world and the way we look at diet, medicine and science. Here you can read countless interesting facts about onions.