In a saucepan, bring sugar and water to a boil with the lime zest; simmer uncovered for 10 minutes. Remove from heat and allow to cool.
Add lime juice to the cooled syrup. Add stevia (can put more as needed for sweetness). If mixture is too acidic, water can be added until the mixture tastes like strong limade. Freeze in an ice cream freezer, churning until slushy.
If you don’t have an ice cream maker your slush can be frozen in an airtight container in the freezer, stirring every thirty minutes (2-3 times) until slushy.
Such a yummy, healthy dessert!
Paula Tipton-Healy L.M, CiHom