Add all the ingredients for the smoothie to a blender and blitz until you get a smooth concoction.
Reserve 1 cup of the smoothie in a bowl and enjoy drinking the rest.
To make the base of the cake, simply mix the dates with the crushed almonds. It can easily be done by hand. Press the mix into a your chosen cake shape, non grease baking paper.
To make the filling, add the water with the agar agar to low heat and stir with a whisk until it begins to thicken. It doesn't need to get to a boil.
Once it begins to slightly thicken (should be around a minute), remove from heat and continue to stir for another minute.
Add the agar agar mix to the smoothie in the bowl and swiftly mix it through with a whisk.
Add the cake filling to the base and place in the fridge.