What is the difference between a Jus, Sauce and a Gravy?

I've just booked my Christmas meal. This included Sausage, mashed potatoes and an Onion Jus. Why Jus and not Gravy?
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Best Answer
What’s the difference between gravy, jus, sauce and coulis?
Will says...
• 'Gravy is made from the juices of oven roast meat, thickend with a starch such as corn flour.
• Jus is made from the same juices that has been refined and condensed to get a clear liquid naturally thickened.
• Sauce could be made from the same juices with other ingredients added such as wines or spirits to compliment the food. Sauces can be served hot or cold.
• Coulis is a thin fruit or vegetable purée, used as a sauce. If the purée is too thick, you can add some water and sometimes sugar'.
My personal feeling for sauces is they can be made from anything. Parsnips, Mushrooms, Celeriac etc when 'Gravy' and 'Jus' must have Meat juices as their base.
On menu's you'll often see 'Gravy' on pub menu's where they aren't trying to sound to posh, probably using some sort of packet mix. Jus' on French style menu's OR people trying too hard. Finally you'll see something like "Beef and Juniper Sauce" on my menu and many others because... Gravy sounds too common and Jus sounds too poncy.
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Quick Answer about "What is the difference between a Jus, Sauce and a Gravy?"
Like gravy, jus (pronounced zhoo) starts with the drippings from cooked meat. Unlike gravy, however, it is not thickened with flour; instead, the liquid is reduced until it reaches the desired consistency, which is usually thinner than gravy.Are brown gravy and au jus the same?
Can I substitute brown gravy for au jus mix? Yes, a 1 ounce packet of brown gravy mix can be used in place of the au jus mix. The flavor may be slightly different, because there is a different sodium amount and seasoning base between the two products.Can I use brown gravy in place of au jus?
What Can You Substitute for Au jus? There are several soup substitutes for Au jus, and they include onion soup mix, brown gravy, bouillon cubes sauce, beef broth, and beef stock powder, among many others. They are a great substitute for Au jus.What is the difference between sauce and gravy?
Definition of Sauce and Gravy: The sauce is a liquid or a cream or a semi-solid food. Gravy is made by adding thickening agents to the juices that naturally run during cooking.Is jus the same as sauce?
Jus is made from the same juices that has been refined and condensed to get a clear liquid naturally thickened. Sauce could be made from the same juices with other ingredients added such as wines or spirits to compliment the food. Sauces can be served hot or cold.Gravy Debate - Sauce or Gravy - Clear Explanation
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