Peel, destone, and scoop out the avocado flesh. Place into a food processor or high speed blender along with the rest of the ingredients. Process until smooth with the consistency of a thick smoothie.
If you’re using an ice-cream maker, pour the mixture in and follow your manufacturer's instructions. If not, pour it into an appropriate dish or deep tray, cover with cling film, and place into the freezer. Be sure to give it a whisk/stir every 30 mins or so until it is frozen and smooth.
Eat straight away or transfer into several airtight or covered containers (to create separate servings) and place back into the freezer until later. It's best to do this as the ice cream freezes incredibly solid and doesn't thaw like regular ice cream does!
Notes
*All cup measurements used are UK cup measurements and so 1 cup = 250ml.
Recipe by Greens of the Stone Age at https://greensofthestoneage.com/supergreens-avocado-ice-cream/