Watermelon Martinis

5 cups watermelon cubes (seed and rind removed)
3/4 cup lemon vodka
6 Tb lime juice
3 Tb cointreau or triple sec
3 Tb sugar

Blend watermelon until smooth. Pour puree into a pitcher and keep very cold, even a little frozen to make it icy.
For two martinis, add one cup of watermelon puree, 1/4 cup of lemon vodka, 2 Tb of lime juice, and 1 Tb each of cointreau and sugar to the blender with 3 - 6 ice cubes. Cover; blend until slushy.

Each serving 150 calories