Cut up the watermelon and remove all seeds.

Puree in a blender or food processor.

Stir into chilled syrup.

Freeze in an ice-cream maker according to the manufacturer's instructions.

Pack into an airtight container and store in the freezer.

In a medium saucepan over medium heat, combine the water, sugar and lemon juice. Cook while stirring until the sugar is completely dissolved. Cool completely.

Carefully pour the liquid into the blender.

Place the watermelon in the blender over the liquid.

Cover the blender and process until the watermelon is completely smooth.

Transfer the watermelon mixture to the bowl of an electric ice cream maker. Make the sorbet according to the manufacturer's directions.

When the sorbet consistency is reached, move the sorbet from the ice cream maker’s bowl to an airtight freezer container.

Freeze until firm.

If the sorbet is too icy to scoop, allow to rest on the counter for 5 minutes prior to serving.