Refreshing Watermelon Bellinis

3 c. cubed, seeded watermelon, frozen
2-3 T. sugar (depending on sweetness of melon)
3 T. fresh lemon juice
3 c. chilled prosecco, sparkling wine or champagne, divided
Julienne-cut lemon rind
1. Place melon, sugar, juice and 1 c. of prosecco in blender.
2. Process until smooth.
3. Pour about 1/3 c. of mixture into each of 8 stemmed glasses.
4. Pour ¼ c. of remaining prosecco into each glass.
5. Garnish with lemon rind.
6. Serve immediately.