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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.
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.
Potato originates from South America, where it was domesticated several millennia ago, and introduced to European explorers in mid-16th century. Ever since then, incredible growth of potato popularity enabled it to become one of the most sought out vegetables that truly managed to shape the look of the modern human civilization. Find out more about potato here.
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.