Preheat the oven to 350 F
Line an 8-inch cake pan with parchment at the bottom. Coat the apple slices with turmeric and sprinkle with brown sugar.
Arrange the apple slices and star anise in the prepared pan.
Mix all the wet ingredients (except Yacon syrup) in a bowl until well combined.
Mix the baking powder, baking soda, and spices into a sieved flour.
Add the flour mixture (slowly, in a few parts) to the wet ingredients and stir in.
Pour gently on top of the apple slices and spread to even it out.
Bake for 35 to 40 minutes or until a toothpick from the center comes out clean.
Cool for 15 -20 minutes, then remove the cake by inverting it over a dish. Carefully peel off the parchment paper.
Pour the Yacon Syrup on top of the cake. Enjoy!