Bring the sugar and water to a boil in a small saucepan
and cook until the sugar has completely dissolved. Let cool.
In a food processor
, puree the watermelon
flesh. Add a little of the sugar syrup
to sweeten, to taste. Pour the pureed watermelon into 2 empty ice cube
trays and freeze for at least 4 hours.
In a blender
combine the frozen watermelon cubes, more simple syrup
, to taste, lemon juice
and vodka, melon liqueur and blend until smooth. Pour into 8 frozen martini
glasses and garnish
with a lemon twist.