Take the dates, half a banana and a little grated apple, BLEND until thick and pasty in a blender or cuisinart (not runny). Don’t add water unless you have to get the blender moving. Put paste aside.
Cut a banana in half then cut in thin slices lengthways (for layers).
Cut/mandoline apple slices very thinly for layers.
Layer down slices of banana then a layer of apples followed by a layer of BAD (banana, apple, date) paste. Repeat.