Watermelon Martini

Directions

1. 1
   In a small saucepan combine the sugar with 1/2 cup water.
2. 2
   Bring to a boil over medium heat, then remove from the heat and let cool.
3. 3
   In a blender add the watermelon, 2 tablespoons of the sugar syrup and the lemon juice and puree until smooth.
4. 4
   Strain through fine mesh sieve into a bowl and discard the pulp.
5. 5
   Fill a pitcher with ice, add the watermelon mixture and stir until chilled.
6. 6
   Pour into chilled martini glasses and top with seltzer.
7. 7
   Add vodka, if desired.