1: In a pot, combine the papaya, mango, sugar, salt, vanilla, and water. Bring to a simmer, cover, and cook for 10 minutes.
2: Stir in the lime zest and juice.
3: Transfer the mixture to a blender and blend on high until smooth.
4: Chill in the fridge for at least 5 hours.
5: Churn the mixture in an ice cream maker according to the manufacturer's instructions.
6: Enjoy immediately for a soft-serve texture, or transfer to the freezer for a firmer consistency.
