Wine reduction concentration describes how the flavour and composition of wine change as water and some volatile compounds evaporate during cooking. Reduction can intensify acidity, sweetness, tannin, bitterness and aroma compounds, depending on the wine and the extent of evaporation. The result is a more concentrated liquid that can form the flavour base of a sauce.
As water evaporates, non-volatile components become more concentrated. Alcohol and some volatile aroma compounds also evaporate, but not all alcohol disappears during cooking. The balance of acidity, sugar, tannin and bitterness can shift as the wine reduces. Excessive heat or over-reduction may produce harsh, burnt or overly acidic flavours.
Reduce wine in a suitable pan with enough surface area to allow controlled evaporation. Add aromatics such as shallots, herbs or spices according to the recipe. Monitor volume, aroma and taste rather than relying only on a fixed time. The reduction should be balanced before stock, jus, cream or other ingredients are added.
Example: reduce red wine with shallots for a Bordelaise-style sauce, then add stock or demi-glace and finish according to the recipe.
Deglazing uses liquid, often wine, to dissolve browned fond from a pan. Reduction evaporates liquid to concentrate flavour and adjust consistency. A sauce may involve both operations in sequence.
Chef’s tip: taste during the final stage of reduction. A small additional volume loss can quickly make acidity and bitterness too intense, especially in sweet or tannic wines.
This term is one of hundreds covered in depth across OCS courses, learning paths, and 1-on-1 coaching with Chef Eric.
