I would like to make the Banana Bread. The ingredients given in your recipe are easily available except sultanas which I am unable to find. Please could you explain what they are and where I may be able to find them? I'm from India.
Nigella's Banana Bread (from Domestic Goddess and on the Nigella website) includes sultanas than are simmered in bourbon or rum before being used in the cake batter. The simmering step is to rehydrate the sultanas so that they are plump and soft. The sultana used in this recipe is a dried fruit, and not the fresh grape.
Sultanas are very similar to raisins. They are both dried grapes but sultanas come from specific types of white seedless grapes and are lighter in colour than raisins. Sultanas tend to range in colour from a medium brown to a very golden colour (sometimes called golden sultanas). In some countries sultanas are known as golden raisins and you may find them under this name. However if they are not available in your area then you can use regular raisins instead. Also if you are not able to use alcohol then you can use orange juice instead of the rum or bourbon.