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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.
Gallery: How to Make a Gastrique. Step 1. Start by adding sugar and a small amount of water to a medium, heavy-bottomed saucepan. Add only enough water until the mixture resembles wet sand. (In this case I used 1/2 cup sugar and 2 tablespoons water.) The tip of a spoon pulled through the mixture should leave a trail. Step 2.