01 - Blend the cubed watermelon until completely smooth. Strain through a fine mesh sieve into a large bowl to remove any pulp if a smoother texture is preferred.
02 - Stir granulated sugar and lime juice into the watermelon puree. Mix thoroughly until sugar is fully dissolved.
03 - In a separate bowl, whip the heavy cream using a hand mixer until soft peaks form.
04 - Gently fold the condensed milk, vanilla extract, and salt into the whipped cream until just combined.
05 - Pour the watermelon puree into the cream mixture and fold gently until the mixture is uniformly colored and well blended.
06 - Transfer the mixture to a loaf pan or airtight container. Cover tightly with plastic wrap or a secure lid.
07 - Freeze for at least 4 hours, or until the ice cream reaches a firm, scoopable consistency.
08 - Let the ice cream sit at room temperature for 5 minutes to soften slightly before scooping into bowls or cones.