A popular refreshment back in colonial times, shrubs are vinegars that have been infused with fresh fruit and sweetened, and enjoyed mixed with sparkling water as a tart soft drink. Today, shrubs are gaining in popularity as both a sweet-tart sipper and as a mixer in the craft cocktail scene. Berkeley-based Shrub & Co. makes theirs by hand in small batches, using only organic ingredients. This shrub amplifies the bright and tangy flavor of ruby red grapefruits. To enjoy, simply mix with sparkling water, sparkling wine, or toss a shot into your favorite cocktail for an unexpected tongue-tingling twist.