A jus need not be thickened with butter. If one desires a thick jus⌠they have gravy.
Before I talk about that, I would like to mention that you should use chicken stock or broth (low sodium, please) in addition to red wine to deglaze, for body as opposed to brightness. It doesnât really thicken it, but if youâve only used red wine I can see that you might be hesitant to reduce it further (which thickens the jus) for fear of not enough jus. For one roast chickenâs worth of drippings, one cup each of red wine and low-sodium chicken broth (or preferably stock) is a good starting point. As UltraScrub advises, reduce until the amount of liquid is halved.
White* roux
Tools:
Chefâs pan/saucir
Good balloon whisk
Ingredients:
1 part fat from drippings or butter
1 part flour
Procedure:
Estimate the number of cups of liquid you need to thicken. For gravy, this would be the jus (see above) from a roast. For each cup, you need about 1 oz each of flour and fat. The fat can be butter or oil from meat drippings (why waste it?). You can use either, or mix them.
Add fat and/or butter to saucir over medium heat. Melt butter, if solid.
Add flour to pan all at once. Whisk constantly for 2-3 minutes or until consistency turns to that of cake frosting.
Lower heat to medium-low. You may whisk slower. When the flour cooks through and loses its raw smell, youâre done. About 5 minutes, maybe.
*A white roux is the basic roux, I guess. It has the most thickening power and the least flavor. The longer you cook it, the darker it gets. The darker it is, the more flavor it has, but the amount of liquid it can thicken decreases.
Now, when you mix the roux and the liquid to be thickened, they must be at opposing temperatures. e.g. one must be hot and the other at room temperature. You cannot mix a hot roux and a hot liquid, nor a room temp roux and a room temp liquid. I wouldnât cool down either past room temperature.
Add 1/2 cup of liquid to the roux (in its pan) and whisk until well-combined
Put pan on high heat and slowly add all but 1/4-1/2 cup of the liquid. Whisk constantly
Lower the heat after the mix starts to bubble to keep it at a low simmer. Simmer for 20-30 minutes, whisking occasionally
Thin the gravy with the leftover liquid until itâs slightly thinner than your desired serving thickness. Serve