what is a gastrique
Freebase(0.00 / 0 votes)Rate this definition: Gastrique. Gastrique is caramelized sugar, deglazed with vinegar, used as a flavoring for sauces. To this a little fond may be added. It is used to flavor sauces such as tomato sauce, savory fruit sauces, and other sweet and sour sauces such as the classic orange sauce for duck Ã  l'orange.