01 - Place cubed watermelon in blender and process until completely smooth. Strain through fine mesh sieve into large bowl to remove pulp if desired.
02 - Stir granulated sugar and lime juice into watermelon puree. Mix thoroughly until sugar fully dissolves.
03 - In separate bowl, beat heavy cream with hand mixer until soft peaks form.
04 - Gently fold condensed milk, vanilla extract, and salt into whipped cream until incorporated.
05 - Pour watermelon puree into cream mixture. Fold gently until fully combined and uniform in color.
06 - Transfer mixture to loaf pan or airtight container. Cover tightly with plastic wrap or lid.
07 - Freeze for minimum 4 hours or until firm throughout.
08 - Let stand at room temperature 5 minutes before scooping and serving.