Grind oatmeal and seeds in a blender until fine crumbs. Preheat the oven to 180 degrees.
Remove pits from dates and add to blender along with olive oil. Mix thoroughly until smooth.
Gently distribute the resulting mass in an even layer over the form. Put in the oven for 10 min.
Peel and core apples, cut into thin slices and stew with lemon zest and juice for 7-10 minutes. Transfer the apples to a bowl, boil the remaining juice for a few more minutes and add to the apples.
Lubricate the finished cake with fruit confiture, put apple slices on top and sprinkle with cinnamon. Bake in the oven for 15 min. at a temperature of 180 degrees. Serve hot!