Beat together the butter and sugar using the whisk attachment on a hand mixer until the mixture turns a paler colour. Stir in the eggs, one at a time, and the vanilla paste. Add the bananas with the tahini and mix everything together. Mix the salt and baking powder, add to the mixture and stir in. Mix in the chocolate and walnut kernels, spoon the mixture into the prepared tin and level off with a spoon.
Decorate and bake
Place the halves of banana alongside each other on the cake mix and press down lightly. Gently warm the honey, drizzle over the bananas and top with a good sprinkling of sesame.
Bake: approx. 50 mins. in the centre of an oven preheated to 180°C. Cover with foil around the end of the baking time if necessary. Insert a wooden skewer to check whether the bread is cooked through. Remove from the oven, allow to cool a little, remove from the tin and leave to cool on a rack.