Anna Thorn, bar manager of Chicago's Boka, describes her split-base blueberry cocktail as "a little salty, a little sweet and a little nutty–the best of everything in one cocktail." But here, you can choose your own adventure depending on which blueberry syrup you go with. Making it with fermented berry syrup balances out the earthy agave notes. Or try it with the salted berry syrup and the salinity complements the sherry's nuttiness.