What's a better lunchbox treat than a delicious, juicy orange, with its sweet, tangy flavor and its own easily peeled protective casing? Technically a cross between a pomelo (citrus maxima, once much more popular among citrus fruits) and the mandarin, oranges in the scientific sense are considered to be berries, the fruit being arils, divided into sections known as carpels, surrounded by the leathery, pocked peel which, like the fruit, is highly nutritious.