Blend the walnuts in a food processor until you have a fine powder.

Add the dates, vanilla extract, cacao powder (hold back half a teaspoon to sprinkle on top if you want to make them fancy looking!) and salt and blend together until you have a smooth paste. Add a tiny bit of water to loosen things up if needed.

Tip the mixture into a bowl and using your hands form balls - the size of the balls is up to you. I have managed to make 10 medium balls but you can make them bigger or smaller. You can sprinkle them with a tiny bit of the cacao powder that you have held back to make them look pretty. You can eat them straight away but if you can contain yourself placing them in the fridge for an hour or two will make them easier to handle and allow the flavour to develop. It will keep in the fridge in an airtight container for about a week.