Preheat the oven to 350°F, line a deep round 7 inch cake pan with parchment paper.
Mix together in a bowl the flours and baking powder. Pour the malt syrup, oil and milk in a jug and also add the lemon zest, a teaspoon of its juice, the vanilla bean seeds and salt.
Wash carefully the apples, if using organic fruit don't peel it. Cut half the apples into small pieces and the other half into slices.
Pour the liquid ingredients from the jug in the bowl with the flour and baking powder, stir with a whisk until you have a smooth batter. Add the apple pieces and stir well.
Pour the batter into the cake pan and level its surface using a spatula. Add the apple slices, pressing them lightly in the dough.
Bake for 50 minutes. Test the cake with a toothpick, if it comes out clean then it's done.
Let the apple cake cool down out the oven, then remove it from the pan and serve.
Note
* Can be replaced with whole-wheat flour ** Can be replaced with agave nectar This apple cake can be stored at room temperature for a couple of days, on a covered cake stand or in an airtight container. You can also keep it in the fridge up to 5 days.