Halve the avocado and scoop out the stone with a spoon, then scoop the flesh into your blender. Peel the banana and break it into the blender. Squash the dates to open them up, pull out the stones, then add the dates to the blender.
Add 1 tbsp tahini and pour in the hazelnut drink. Add a few ice cubes and whizz till smooth and creamy. Pour into 2 glasses and serve.