Tonic, Volfson says, is commonly thought of as a basic carbonated beverage. But she thinks of it more from the apothecary lens. Tonic water contains quinine, derived from the cinchona tree ...
Made from carbonated water, sweetened with corn syrup, and flavored with quinine and botanicals like citrus peel, gentian, and ginger, it’s a bittersweet drink with a fascinating history.