In a bowl place the flour, oats, sugar, butter and cinnamon cold and make crumbs. Peel apples and cut them into small pieces, pour them in a suitable pan (best in elliptical yen), sprinkle with the 3 tablespoons sugar and top with crumbs nice cover without squeezing. Sprinkle with chopped walnuts or almonds and bake in a preheated oven at 180C degrees until a nice baked crust. Serve cold krambala and optional with whipped sour cream with sugar. * This cake can be prepared by replacing apples with other fruits, raspberries, strawberries or a mix of berries and add cinnamon.