Heat the oven to 180C/160C fan/gas 4 and line a 20cm springform cake tin with baking parchment. Whisk the melted butter, yogurt, 200g brown sugar, the eggs and vanilla together in a jug to combine. Mix the flour, desiccated coconut, baking powder, spices and 1/2 tsp salt together in a bowl.

Pour the wet ingredients into the dry and mix into a smooth batter. Pour into the tin, then arrange the plums on top. Scatter over the 1 tbsp brown sugar and coconut flakes, if using. Bake for 1 hr 10 mins, or until risen, golden and a skewer inserted into the middle of the cake comes out clean.

Leave to cool in the tin for 15 mins, then transfer to a wire rack to cool slightly. Serve warm with a spoonful of coconut yogurt, if you like, or leave to cool completely. Will keep in an airtight container for three days or frozen for three months.