Preheat the oven to fan 160C/ conventional180C/gas 4. Butter and line the putrid of two 20cm sandwich tins. Coarsely grate two thirds of the chocolate and slit the relief. Role aside.
Set aside the flour, baking powder and sugar into a tall mixing bowl. Invent a smartly within the centre and add the butter, eggs and milk (the butter wants to be very refined for this to work). Beat on the side of a handheld electric trot for approximately 2 minutes until gentle and fluffy (or employ a wooden spoon and beat smartly for 3 minutes). Evenly fold within the grated, chopped chocolate and mashed banana.
Divide the mix evenly between the tins. Gently level the ground with the support of a metal spoon or spatula. Bake aspect by aspect on the heart shelf for 25-Half-hour until springy to the contact and starting build to shrink away from the sides.
Effect from the oven, shuffle away to chill within the tins for five minutes. Turn out on a wire rack, make a choice the lining paper and shuffle away to chill for approximately 1 hour earlier than icing.
For the icing and filling, break up the white chocolate into a heatproof bowl and melt gently over a pan of sizzling, now not rather simmering water until factual melted. Effect from the pan and situation aside for five-6 minutes.
Duvet a baking sheet with foil or waxed paper. Dip the cherries, one after the opposite, into the chocolate to half of coat them, then set them on the baking sheet to situation.
Dart the crème fraîche into the final melted chocolate until at ease and shimmering. Then let cool and thicken (5 minutes or so). Now switch half of of this combination to one other bowl. Pit one other 200g/8oz cherries, decrease them in half of then add to one of many bowls with 2tbsp kirsch (non-obligatory) and drag until blended. Set aside one sponge cake on a serving plate and unfold the ground with the cherry combination, then sandwich with the second sponge. Spread the the leisure of the chocolate combination over the high and decorate with the dipped complete cherries. This cake is most attention-grabbing eaten on the day it’s been made.