A dark-brown sauce consisting of oysters, brine and soy sauce cooked until thick and concentrated. It's a popular Asian seasoning used to prepare myriad dishes (particularly stir-fry dishes) and as a table condiment. Oyster sauce imparts a richness to dishes without overpowering their natural flavor. It's available in many supermarkets and all Asian markets.
From The Food Lover's Companion, Fourth edition by Sharon Tyler Herbst and Ron Herbst. Copyright © 2007, 2001, 1995, 1990 by Barron's Educational Series, Inc.