To make a rich gravy or pan sauce from stock, reduce the stock to concentrate its flavor, then thicken it with a roux, slurry, or by mounting with butter. Additional ingredients like wine, herbs, and pan drippings enhance the flavor.
Creating a flavorful gravy or pan sauce from stock involves several key steps:
Start with a good stock: The quality of your stock directly impacts the final sauce. Homemade stock is best, but high-quality store-bought stock works too. Ensure it's well-seasoned but not overly salty, as it will concentrate during reduction.
Deglaze the pan (for pan sauce): If making a pan sauce after roasting or searing meat, deglaze the pan with wine, stock, or another liquid. Scrape up all the browned bits (fond) from the bottom of the pan; these are packed with flavor.
Reduce the liquid: Pour the stock (or deglazed pan drippings) into a saucepan. Bring to a simmer and reduce the liquid by half or more. This concentrates the flavors and creates a richer base. Watch carefully to prevent scorching.
Thicken the sauce: Choose one of the following methods:
Roux: Melt butter in a separate saucepan, then whisk in an equal amount of flour. Cook over medium heat for a few minutes to cook out the raw flour taste (a blonde roux). Gradually whisk the hot stock into the roux until smooth. Simmer until thickened.
Slurry: Mix cornstarch or arrowroot powder with cold water to create a slurry. Gradually whisk the slurry into the simmering stock until thickened. Be careful not to add too much, as it can become gloppy.
Mounting with Butter: For a glossy, rich sauce, whisk in cold butter, one tablespoon at a time, off the heat. This adds richness and body without significantly thickening the sauce.
Season and Finish: Season the sauce with salt, pepper, and any desired herbs (thyme, rosemary, bay leaf). A splash of lemon juice or vinegar can brighten the flavor. Strain the sauce through a fine-mesh sieve for a smoother texture, if desired.
Don't over-thicken your gravy or sauce. It should be thick enough to coat the back of a spoon, but still pourable. Remember that it will thicken slightly as it cools.