Sparkling Grapefruit Shrub Mocktail

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"Vinegar has been touted as a “health tonic” for ages, especially in Asia. It’s supposed to help digestion, clear skin, and aid in weight loss. I can’t promise you any of those things.. except that this sparkling grapefruit shrub (made with apple cider vinegar!) is refreshing, delicious, and the best kind of mocktail!"
-- @littleepicurean