
Blueberry syrup is a sweetened fruit syrup made from blueberry fruit or its juice combined with sugar and water.
Sweet and jammy, carrying a clear blueberry fruitiness with only a faint acidity.
Serving as both sweetener and fruit-flavour accent, it is stirred or shaken into the build to add body and a deep blue-purple tint; because purchased versions are heavily sweetened, its sugar load must be balanced rather than treated as a mere flavour accent, so it is dosed in small measures.
For its sweetening load, plain sugar syrup or another fruit syrup of similar concentration works; for a small colouring or fruit accent, another red-purple fruit syrup swaps in with a flavour shift, but where blueberry is the drink's defining flavour no substitute preserves that identity.
Blueberry syrup pairs blueberry (Vaccinium) fruit or its juice with a large proportion of sugar and water, yielding a thick, deep blue-purple liquid. Its heavy sugar content distinguishes it from an unsweetened blueberry juice.
Refrigerate after opening and discard if it ferments or grows mould, particularly for house-made batches.