In a blender or food processor, puree watermelon, lime zest and juice, and orange juice until smooth.

Pour watermelon mixture into a shallow dish and cover tightly with plastic wrap.

Freeze, mixing every hour, until frozen, about 3 hours.

Using the tines of a fork, scrape mixture until flakes form.

Freeze, covered, until ready to serve in margarita glasses, garnished with lime wedges, if desired.

Courtesy of the 28 Day JOY of KOSHER Challenge by Jamie Geller and Tamar Genger MA, RD.