How to Turn the Brown Bits at the Bottom of a Pan into Sauce

The layer forms when proteins and sugars from meat and vegetables stick to the pan and dry at high heat; it holds the aromas of everything cooked in the pan. Its color can turn dark brown, and that is the point at which it should be kept for the sauce. If the fond is black and smells smoky, it cannot be salvaged: wash the pan and make the sauce another way, because the bitterness of the burned layer will transfer to the sauce no matter which liquid is used. To tell the difference, smell it: a sweet, toasted aroma means the fond can be used for sauce, while a sharp, bitter smell means it should be discarded.

Follow these steps: remove the meat or vegetables from the pan, pour off any excess fat, and lower the heat to medium. While the pan is still hot, add liquid; 50–60 ml per serving is enough. The liquid will begin to sizzle and evaporate. Meanwhile, scrape the entire bottom of the pan with a wooden or silicone spatula. The stuck bits will dissolve into the liquid within a few seconds, and the bottom of the pan will look completely clean. Scrape the dark ring around the edges too; the fond is most concentrated there. Add loose crumbs that are not stuck to the bottom to the sauce as well rather than leaving them in the pan.

Use meat stock, chicken stock, or plain water as the liquid. Plain water is enough to loosen the fond because heat and the mechanical action of scraping do the work. Acidic liquids such as tomato juice, lemon juice, and vinegar loosen the fond faster, but using them alone makes the sauce sharp; one spoonful alongside another liquid is enough. Add milk and cream at the end because they can curdle over high heat. To keep steam from hitting your face, remove the pan from the heat before adding the liquid.

Simmer the sauce over an open flame until its volume has roughly halved. This takes two to four minutes and is the main step that thickens the sauce. If it is still not thick enough, whisk a small piece of cold butter into the sauce after removing it from the heat. The butter binds and glosses the sauce, but it will separate if added while the pan is still over the heat. Adjust the salt at the end: as the sauce reduces, its salt becomes more concentrated, so salting at the beginning can leave it too salty. If you want to remove any remaining bits of fond, strain the sauce through a fine-mesh strainer; otherwise, pour it over the meat as is.