Plain (all-purpose) flour 300g
Baking powder 1 ½ tsp
Light muscovado sugar 175g
Lime rind, grated 1tsp
Medium egg, beaten 1
Medium banana, mashed with 1tbsp lime juice 1
Low-fat natural fromage frais (unsweetened yogurt) 150ml
Sift the flour, salt and baking powder into a mixing bowl and stir in the sugar and lime rind.
Make a well in the centre of the dry ingredients and add the egg, banana, fromage frais (yogurt) and sultanas. Mix well until thoroughly incorporated.
Spoon the mixture into the tin and smooth the surface. Bake for 40-45 minutes until firm to the touch or until a skewer inserted in the centre comes out clean. Leave to coll for 10 minutes, then turn out on to a wire rack.