Beniharuka Sweet Potato (紅はるか)

Beniharuka, officially registered in Japanese as べにはるか and commonly written 紅はるか in shops, is one of Japan’s best-known sweet potato cultivars for moist, strongly sweet yakiimo. It has reddish-purple skin and pale flesh that turns deeper yellow and much softer when cooked. In general, Japanese sweet potatoes, known collectively as satsumaimo, range from dry and fluffy to moist and creamy. Beniharuka belongs firmly to the second group, especially after some weeks of storage and slow cooking. First, this guide traces where the cultivar came from, why storage and heat change its sweetness and texture, and how to cook it at home. Along the way, it separates breeding research and official statistics from regional branding and sweetness claims on shop signs. TOCWhat Is Beniharuka Sweet Potato? Beniharuka is a sweet potato cultivar developed primarily for table use rather than industrial starch or spirits. Breeders at the Kyushu National Agricultural Experiment Station made the original cross. That station’s work now sits within the Kyushu Okinawa Agricultural Research Center, part of NARO, Japan’s national agricultural research organization. What distinguishes it, above all, is high swee...