A tall gin and tonic over ice is everything you want in a summer cocktail...icy cold and pleasantly sharp. But sometimes even the classics can seem a little uninspired. To liven things up - after all, isn't that what a cocktail should do? - I kept the same simple recipe but added pickle brine. Our palate perceives both bitter and sour as refreshing so adding pickle brine makes the cocktail doubly invigorating. It's a mini-vacation in a glass.