Paleo and Gluten Free Almond Apple Crumble Cake Slice Here is a really simple and quick apple cake slice recipe which is paleo, gluten and sugar free. The magic is that there isn´t any butter in it but it´s still so moist and nice that it just melts in your mouth. The almonds give enough natural oils so you don´t have to worry that it´s dry. When you try this without knowing what´s in the cake, then it´s quite easy to guess that it´s full of refined sugar and wheat flour (plain flour).