In a blender, blend the walnuts until they are almost in a paste, then add the dates, Stevia and cacao.
Slowly add in the coconut oil as the mixture is blending. Once the mixture is totally blended together transfer it using a spatula into a cake tin or baking dish.
Place the mixture in the freezer for half an hour then refrigerate until it is needed to be eaten.
Toppings: Grate some 100% cacao on top, serve with fresh berries, yoghurt or cream.