In a blender mix the white flour, almond flour and the sugar, the whole eggs, the butter, the grated lemon rind, a teaspoon of yeast and a pinch of salt, for a few minutes. When the dough is ready line the baking dish with baking paper which has been soaked in water and wrung out, grease with butter, place the dough inside, and spread out evenly. Place the dish in the refrigerator and chill for about an hour.
In the meantime peel the apple, then slice almost to the bottom, leaving the slices just about connected. Place the apples onto the pie dough, brush with 20 g of softened butter, and sprinkle the pie with a little icing sugar in order to create a caramelized layer on top. Bake the pie in a preheated oven at 180 degrees for 50 minutes.