Bake in the oven for 45-50 minutes, until the crumble topping is golden-brown. Allow to cool for ten minutes in the tin, then transfer the cake in its paper to a cooling rack.
Meanwhile, mix the topping ingredients together in a bowl. Remove the cake and carefully sprinkle the crumble over the top with your fingers. Do it little by little, so that it does not sink into ...
This chocolate plum cake ... crumble, once cooled, enjoy it as a cake or as a sweet-afters served warm with custard or ice cream. The delicious Muscovado sugar melts into a sticky topping.