Preheat oven to 190 C.
Grease 3 ramekins or mini cake tins.
Grease each with a little ghee, and then sprinkle the base with 1/2 tsp brown sugar each.
Chop the plums, adding 1/2 a plum to each tin, followed by 1/2 a tsp of chopped walnuts.
In bowl of stand mixer, beat the clarified butter and coconut sugar for 2 minutes on high speed.
Mix egg and vanilla extract and beat again.
On the lowest speed, stir in flours, baking soda and buttermilk.
Mix remaining walnuts.
Divide between the prepared ramekins/tins.
Allow to sit in tins/ramekins for 10-15 minutes.
Bake them in preheated oven for 25 to 30 minutes, or until a tester comes out clean. After it is baked cool on wire rack.
Then turn over a platter and tap out. Garnish with walnuts and mint leaves.
Serve warm with vanilla ice cream or just like that.