Heat the oven to 180°C (160°C fan) and line a 900g loaf tin with baking paper
Put the 400g banana, eggs and butter into a blender and blitz until you have a smooth paste
Put the buckwheat flour, plain flour, a pinch of salt, baking powder, cinnamon, brown sugar, caster sugar and ¾ of the pecans into a large mixing bowl and mix until combined
Whilst stirring, gradually pour the wet mixture into the dry until you have a smooth batter. Pour into the lined loaf tin and smooth over the top. Place both banana halves on top, cut side facing up and sprinkle over the remaining pecans
Bake for 50 minutes to 1 hour until golden and a skewer inserted comes out clean. Leave to cool for 5 minutes in the tin before removing onto a cooling rack and leaving to cool completely
Meanwhile, whisk all the espresso butter ingredients in a large bowl or the bowl of a stand mixer until pale and fluffy
Serve the banana bread toasted with a slathering of the espresso butter
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