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Tomato, Solanum lycopersicum, plants which give red fruit. Although it's botanically a fruit, culinary it's vegetable, because it's not sweet. It is believed that there are around 7500 varieties of tomatoes. Tomatoes can be determinate or indeterminate, but also based on shape and size there are types: Beefsteak, Plum tomatoes, Cherry tomatoes, Grape tomatoes, Campari tomatoes, Tomberries, Oxheart, Pear tomatoes...
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.
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.
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.