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Preheat oven to 180°C and line a loaf tin with baking paper, extending the baking paper about 2 cm up over the sides of the tin
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Mash the bananas until fairly smooth and shiny.
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In a large bowl, whisk together the oil, tahini, dark brown sugar and vanilla. Add the eggs, one at a time, and whisk until silky. Stir in the yogurt and banana.
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In a separate bowl, stir together the flour, baking powder, baking soda and salt with fork.
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Add to the banana mix and fold in to just combine. Fold in the dark chocolate and walnuts.
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Pour into your prepared loaf tin. Place half a banana (sliced lengthways) on top to decorate. Scatter a layer of demerera sugar over the surface of the loaf.
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Bake for 40-50 minutes until the surface springs back to touch. A skewer inserted may still come out with crumbs / bits of batter but not be completely runny.
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Leave to cool completely in the tin.