Whisk eggs, sugar, oil, and sourdough together in the mixing bowl.
Mix flour and spices together and then add it to the bowl with the wet ingredients.
Mix everything well in the mixer and finally add nuts, coconut, carrots, and apple.
Fold it together until just combined.
Preheat the oven to 175 degrees Celsius (347 degrees Fahrenheit) (convection).
Pour the batter into a springform lined with parchment paper and bake the cake
in the preheated oven for about 45 minutes.
Check with a knitting needle to see if it passes the test and comes out dry.
Take the cake out of the oven and let it cool in the form.
Finally, dust with sifted powdered sugar.