Against the grain: as prices and temperatures rise, can Japan learn to love imported rice?

It's cheap, filling and a time-honoured way for office workers to calm their hunger pangs. Lunchtime diners at fast-food restaurants in central Tokyo are here for one thing: gyudon - thinly sliced beef and onions on rice. The topping is rich and moreish, but it's the stickiness of the plump japonica grains beneath that make this one of Japan's best-loved comfort foods. Rice cultivation in Japan stretches back thousands of years. In the Edo period (1603-1868), a meal for most people meant a simple bowl of unpolished grain, while members of the samurai class measured their wealth in rice bales….