1. If mango and peach fruit chunks are frozen, thaw them in the microwave. About 1-2 minutes on defrost setting. It's ok if they're still a little frozen
2. Add sugar, salt, lime juice, and vanilla extract
3. Use a potato masher or wooden spoon, mash ingredients in a big bowl
4. Add coconut milk and mash a little bit more, until there are no more large chunks of fruit
5. Transfer to container and freeze on a level surface for about 16 hours