Baltimore native Lindsay Hargrave turned a quest begun in the early 1990s into Lindsay’s Southside, a maker of fresh cocktail mixers built around real lemon juice and mint. The company also produces Bloody Mary mix and ready-to-drink seltzers, extending a recipe developed through years of gatherings with friends and family. Its playful Maryland identity carries through to George, the Bernadoodle mascot, and Corky, its mobile bar for events.