My Favorite New Cocktail Ingredient: Shrubs

I like to add an ounce of  McClary Brothers Michigan Rhubarb Shrub to a traditional Gin and Tonic (I use Two James' Old Cockney Gin and Fentimans Tonic Water )

According to McClary Brothers:

Drinking Vinegars, more commonly referred to as "Shrubs", are a Colonial-era drink mixer. We combine organic, unpasteurized apple cider vinegar with fresh, seasonal ingredients and organic cane sugar. The result is a refreshing, exciting mixer that we know you’ll enjoy as a cocktail or shrub soda.