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.