This is a favorite with Jews from Basra in Iraq as well as Iranian Jews. Dried limes can be bought from Middle Eastern grocers, but you can also make your own by taking fresh limes and drying them slowly in a warm place, such as over a radiator. When the skins are tough, leathery, and yellow-brown, the limes are ready. They can be stored indefinitely in an airtight tin but should not be refrigerated.