Controlled reduction of gravies intensifies and concentrates flavors by evaporating water, which increases the concentration of dissolved solids like salts, sugars, acids, and aromatic compounds. This results in a richer, more potent flavor profile.
The process of reducing a gravy involves simmering it over low to medium heat without a lid. This allows water to evaporate as steam. As the water content decreases, the remaining ingredients – including flavor compounds derived from meat, vegetables, herbs, and spices – become more concentrated. This concentration effect significantly enhances the perceived intensity of the gravy's flavor. Furthermore, some chemical reactions occur during reduction, such as the Maillard reaction (browning), which can create new and desirable flavor notes. The key is 'controlled' reduction. Over-reduction can lead to a gravy that is too thick, salty, or bitter. Careful monitoring and tasting are essential to achieve the desired flavor and consistency. The reduction process also allows the gravy to thicken naturally, as the increased concentration of starches and proteins contributes to a richer texture.
When reducing a gravy, use a wide, shallow pan to maximize surface area and accelerate evaporation. This will help you achieve the desired consistency and flavor more quickly and evenly, preventing scorching.