gastrique

thumb|250px|Scallop with a [[tangerine gastrique]] Gastrique is caramelized sugar, deglazed with vinegar or other sour liquids, used as a sweet and sour flavoring for sauces.

The gastrique is generally added to a fond, reduced stock or brown sauce. It is also used to flavor sauces such as tomato sauce, savory fruit sauces, and others, such as the orange sauce for duck à l'orange.