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 - Add granulated sugar and lime juice to watermelon puree. Stir thoroughly until sugar completely dissolves.
03 - In separate bowl, beat heavy cream with hand mixer until soft peaks form and cream holds shape briefly.
04 - Gently fold condensed milk, vanilla extract, and salt into whipped cream until just incorporated, maintaining light texture.
05 - Pour watermelon puree into cream mixture and fold gently until fully blended and uniform color achieved.
06 - Transfer mixture to loaf pan or airtight container. Cover tightly with plastic wrap or lid to prevent ice crystals.
07 - Freeze for minimum 4 hours until firm enough to scoop. For best texture, freeze overnight.
08 - Let ice cream sit at room temperature 5 minutes before scooping to soften slightly. Serve immediately.