What is the purpose of whisking in butter at the end of a pan sauce?

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Finishing a pan sauce by whisking in butter is about emulsification and enrichment. When you whisk in cold butter, the fat breaks into tiny droplets that disperse through the warm sauce, creating a stable emulsion that coats the sauce and the plate with a glossy, velvety finish. This not only gives the sauce a luxurious mouthfeel but also rounds and carries flavors, making the sauce feel richer and more cohesive. For best results, add the butter gradually and whisk or swirl off the heat so the emulsion stays intact and doesn’t separate. This step isn’t about cooling the sauce, increasing acidity, or reducing it; its purpose is to blend in fat to enrich and emulsify the sauce.