
Elderflower syrup is a sweet, non-alcoholic flavouring made from a sugar-and-water solution infused with the blossoms of the European elder, Sambucus nigra.
Delicately floral and aromatic, with high sugar sweetness carried on a light body and a mild citrus tartness on the finish.
Dosed as a floral sweetener, it is added in small measures to sweeten and perfume a build; because it is usually sold as a sweetened cordial concentrate, its as-purchased sugar and intended dilution should be accounted for when balancing a drink.
Where elderflower is only a light accent, a plain sugar syrup restores the sweetness and body, with a little citric acid or lemon for the tartness — but the floral elderflower aroma cannot be reproduced from an unrelated syrup, so no substitute works where that character defines the drink.
Elderberry syrup
Elderflower syrup is infused from the pale aromatic blossoms of Sambucus nigra and is delicate and floral; elderberry syrup is made from the dark ripe berries of the same plant, giving a deeply coloured, fruity syrup from a part that must be cooked to be safely edible.
Makers steep fresh elderflower heads in a sugar-and-water solution and then strain the blossoms out, so the flavour is drawn from the flowers by infusion rather than by pressing or distilling. Citric acid or lemon is commonly added for tartness and as a preservative, and the result is often a concentrate meant to be diluted with still or sparkling water.
The commercial and homemade forms rely on added acid to preserve them; without it the sugar-water infusion is perishable, so refrigerate and expect a short shelf life.
Elderflower cordial carries a Victorian heritage and is traditionally associated with Northwestern Europe, where it is still made in the traditional way.