Au jus the cook may simply skim off the fat from the juices left after cooking and bring the remaining meat stock and water to a boil. "Jus" can be frozen for six months or longer, but the flavor may suffer after this time. American recipes "au jus" often use soy sauce, Worcestershire sauce, salt, pepper, white or brown sugar, garlic, beets, carrots, onion, or other ingredients to make something more like a gravy. The American "jus" is sometimes prepared separately, rather than being produced naturally by the food being cooked. An example could be a beef "jus" made by reducing beef
Red cooking hot or cold, and the sauce or stock is often reused as master stock. Red cooking Red cooking, also called Chinese stewing, red stewing, red braising and flavour potting, is a slow braising Chinese cooking technique that imparts a red colour to the prepared food. There are two types of red cooking: Red cooking is popular throughout most of northern, eastern, and southeastern China. The name is derived from the dark red-brown colour of the cooked items and its sauce. Soy sauce (usually a mix of light and dark soy sauce), fermented bean paste, red fermented tofu or rock sugar