Peel the avocadoes and remove the seeds.
Add avocado, milk, sugar, mint, and salt and blend until nicely pureed.
Add cream and whisk until combined.
Strain mixture to get rid of any pieces that haven't been pureed.
Refrigerate for 2-3 hours or overnight.
If you have an ice cream maker churn as per manufacturers instructions.
If you don't have an ice cream machine simply add the chilled mixture to the freezer. As it starts to harden, remove from the freezer and whisk until nice and smooth. Then continue freezing until hard.