3. Whisk together the soy milk, vanilla, oil, and vinegar. Pour into the dry ingredients and gently stir. Fold through the plums.
4. Tip the mixture into the tin and flatten the top with the back of a spoon. The mixture is quite dry, don't be alarmed. Place into the oven for 40-45 minutes until lightly browned. Remove and cool in the tin.
5. To make the icing - mix the icing sugar, coconut, coconut oil and lemon juice together well. Spread on the cooled cake and decorate with dried plums and toasted coconut.