The iyokan is one of Japan's most-eaten winter citrus — a large, juicy tangor with a thick, deep-orange, easy-peel rind and a fragrance so bright it perfumes the whole room when opened. Second only to the satsuma among Japan's home-grown mandarins, it eats sweet-tart and intensely aromatic, with generous, loose segments that pull away from a loose skin, making it a beloved New Year and midwinter fruit given and eaten out of hand across the country.