To make the sorbet syrup, combine water with the sugar, tapioca starch, corn syrup, and lemon zest in a small saucepan over medium to medium-high heat.
Stir continuously for about 8-11 minutes until the mixture just starts to boil (do not allow it to come to a full boil) Once the texture of the syrup becomes thicker and viscous (or once it hits 212 degrees if you are using a thermometer) immediately take it off the heat.
Place it in a container (including the zest) Let it cool to room temperature then refrigerate for a minimum of 4 hours to a maximum of 24 hours.
Discard the zest and thoroughly mix the lemon juice with the sorbet syrup.
Process in your ice cream maker according to the manufacturer’s instructions.
The sorbet is finished when it reaches the consistency of soft-serve ice cream (about 20-30 minutes in most machines)
Scoop into a container, place a piece of plastic wrap or parchment paper on the surface and freeze until firm (2-4 hours minimum)