Rhubarb Spritzer

Directions

1. 1
   In a medium saucepan, stir rhubarb, sugar and lemon juice over medium heat until sugar dissolves.
2. 2
   Bring to a boil, then reduce heat to medium-low.
3. 3
   Simmer, stirring occasionally, until rhubarb breaks down completely, about 6 minutes.
4. 4
   Strain through a fine-mesh sieve, pressing solids to extract as much liquid as possible.
5. 5
   Discard solids.
6. 6
   Cover and refrigerate until cold, at least 2 hours and up to 1 day.
7. 7
   Divide syrup amount 8 glasses.
8. 8
   Top with seltzer or Cava wine.
9. 9
   Garnish with lemon and grapefruit slices.
10. 10
    Serve immediately.