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Heat the oven to 175 degrees.
Mix the melted chocolate and all the dry ingredients in a bowl.
Mix the butter, eggs and Tagatesse in a separate bowl.
Mix all the ingredients together and stir well until you can't see any more dry parts.
Chop the walnuts coarsely and mix them into the batter.
Grease a cake tin and divide the batter over it.
Bake the cake for 30-40 minutes in the preheated oven.