IruFermented locust beans
In Yoruba towns from Ibadan to Ogbomoso, iru is the smell of a good stew: a spoonful of the dark, fermented locust beans melted into efo riro, ofada ayamase, gbegiri and ewedu changes the whole pot. Making it is women's work passed down over generations, done in the dry season when the yellow pods of the African locust bean tree (igba) ripen. The seeds are boiled for hours, rubbed free of their black hulls, boiled again and wrapped warm in leaves for two or three days, when a sticky bacterial ferment covers them. Iru woro is left whole; iru pete is mashed. Expect a powerful ammonia-and-cheese smell, a soft, sticky texture and a deep savoury, almost meaty taste once cooked. Common mistake: fermenting too cool; below 30 °C the beans go sour and grey instead of developing the rich, sticky coat. Keep them in a warm oven with only the light on, or in a cooler box with a hot-water bottle. It is ready when the beans are dark brown, sticky and covered in fine white threads. Chef's tip: dried locust beans are sold at West African shops; fermented soybeans make a fair substitute.























