Zanzibar is often known as the spice island. The exoticism of its name can only be matched by the transporting scent of fresh cloves, miles away from the Christmassy fustiness of their dried cousins. But if you come here to visit, what should you take home with you? Often pre-packaged spice mixes feature overground spices that are past their best - the humidity here means that things go soggy and lose their oomph quickly.