Blueberry syrup is a deep, indigo-toned infusion made by simmering plump blueberries with sugar and water until the berries burst into a thick, aromatic sweetener. Thanks to the natural antioxidants and dark-berry skin tannins, it delivers rich, jammy, and slightly woodsy notes—often polished with a hint of lemon peel or a touch of vanilla—making breakfast pancakes, iced lattes, and gin fizzes taste more intense, more complex, and more "berry-fresh" than regular simple syrup.