Add the plums, chocolate broken in small bits and the chopped nuts. Keep some nuts to decorate the cake
Sieve the flour and baking powder and add to the mix
Line a metal cake tin with butter or use a flexible silicon round mould and bake at 160 degrees for 50 minutes
Spoon some of the plum jam on the warm demouded cake and sprinkle with more chopped walnuts. For those wanting an extra chocolate kick, you can also sprinkle some grated milk chocolate when the cake is cool.