Soak cashews in boiling water for at least 30 minutes
Put plant milk and half the peppermint leaves in a saucepan. Bring to a simmer then turn heat to low to infuse.
While infusing, bruise the mint leaves with a cocktail muddler or wooden spoon to release the flavour. Turn off the heat and allow to cool. Strain through a fine sieve.
Put the infused plant milk along with all the other ingredients, except the dark chocolate chunks or chips, in a blender and blend until completely smooth. Place the mixture in the fridge and allow to get as cold as possible.
Pour into an ice cream maker and freeze. When frozen but still soft, tip into a bowl along with the dark chocolate chunks or chips and stir to combine thoroughly.
Transfer to an airtight tub and freeze for an hour or so and serve. If you freeze for longer and it's solid, remove from the freezer 20 minutes before you want to eat it. Enjoy!!