Place frozen watermelon into food processor
Process until watermelon is completely chopped up and looks like a snow cone - which is pretty awesome in itself
Add yogurt, honey, and lime juice
Process until smooth
Pour into a loaf pan or other freezer container
Freeze for at least four hours, stirring every hour until completely frozen
This freezes pretty solid, so you'll want to take it out of the freezer and let it warm up 10 - 15 minutes before serving