As kimono-clad people danced through the streets of the Minami Otsuka district of northern Tokyo during a summer festival last month, a small Pakistani curry stall was doing a roaring trade.

The stall, run by local Muslims, sold out its entire stock of some 200 trays of curry, Tunisian salad and Moroccan tea within a couple of hours.

"Some customers seem to like our food so much and asked us where we run a restaurant," said Aquil Siddiqui, 58, a Pakistani resident of Otsuka and a representative of Otsuka Mosque, one of about 60 mosques in Japan.