
Strawberry cordial is a non-alcoholic concentrated strawberry syrup, also called squash, diluted before drinking.
Ripe strawberry dominates, over a heavy sweetness and a light fruit acidity.
Reached for when a drink needs both sweetness and strawberry flavour in one pour, it is stirred or built in as a concentrated syrup and dosed to sweeten; a small measure adds colour and aroma without carrying the flavour.
As a small sweetening or colouring accent, another fruit syrup works with tolerable loss, since the sweetness and syrupy body can be rebuilt from any comparably concentrated sugar syrup; but where the drink is meant to taste of strawberry, the specific strawberry flavour cannot be reproduced from an unrelated fruit or a plain sugar syrup.
Fruit liqueur (American 'cordial')
The British strawberry cordial is a non-alcoholic sugar-and-fruit syrup diluted before drinking; in American usage 'cordial' means a sweetened alcoholic liqueur. The same word covers two different products.
Both are sweet strawberry concentrates of water, sugar and fruit. The 'cordial' label leans toward a fruit-juice-based diluting concentrate and 'syrup' toward a plain sugar-water flavouring, but the two overlap heavily and are often used interchangeably.
In British usage a cordial is a concentrated fruit syrup made from fruit juice, water and sugar or a sugar substitute; the strawberry version carries strawberry flavour. The bare name is ambiguous, since in American usage "cordial" instead denotes a sweetened alcoholic liqueur.
A homemade version with no alcohol or preservatives is perishable; refrigerate after making or opening.