Rhubarb Spritzer

Instructions

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