01 - With a sharp knife, halve the mini seedless watermelons. Scoop out the flesh using a spoon, reserving the shells intact. Place emptied shells in the freezer to chill.
02 - Combine watermelon flesh, lime juice, and sugar in a blender. Puree until completely smooth.
03 - Refrigerate watermelon mixture for at least 1 hour to ensure it is well chilled.
04 - Process chilled mixture in an ice cream maker for 20 to 25 minutes, or until the texture is light and airy.
05 - Spoon freshly churned sorbet evenly into the frozen watermelon shells. Level the surface for uniform freezing.
06 - Freeze filled watermelon halves for 3 to 4 hours, until firm. Serve garnished with fresh mint leaves.