Flourless banana cake

My business partner at MG Garage, Greg Duncan, loves bananas, so during the 5 years the restaurant was open, we did everything we could with them: soufflés and ice-creams, baked and caramelised. So what to do for his 50th birthday? I finally came up with this light, moist, flourless cake and served 50 small versions, each topped with a banana covered in pink jelly. You’ll need about 3 large bananas for this recipe - very ripe bananas are best. The cake is best eaten the day