3–4 very ripe bananas (about 325g/11½oz peeled weight), mashed using a fork
1 tsp baking powder
100²µ/3½´Ç³ú soft light brown sugar
1 tsp ground mixed spice
50g/1¾oz shelled pecan nuts, chopped (optional)
300²µ/10½´Ç³ú self-raising flour
100²µ/3½´Ç³ú sultanas
150ml/5fl oz sunflower oil, plus extra for greasing