In the meantime, today I made concentrate for spritzer
2 lbs rhubarb
2 1/2 cups water
3/4 cup sugar
2 tblsp lime juice
Combine chopped rhubarb with sugar and water. Bring to a boil and simmer for 10 min. Strain, pressing on fruit to get all the juice. Discard fruit remains. Cool, add lime juice. Combine with sparkling water.
Spritzer with fabulous metal straw