Big supermarkets in Dubai already carry many mushrooms commonly used in Japanese cooking, like shiitake and enoki. But it is still difficult to find mushrooms here that were cultivated in Japan. "Shiitake grown using Japanese logs contain lots of guanylic acid, which is the source of umami," said Kazuhide Sugimoto, the head of the shiitake distributor that hosted the February tasting. Sugimoto's company -- named Sugimoto -- tests its mushrooms for insect eggs so they can be certified kosher, or compliant with Jewish dietary rules. "Both demand and the number of growers are falling in Japan, and we are most interested in expanding in the Middle East," he said.