see how Demi is used below.....I just add it straight in.
here is one thread
https://www.smokingmeatforums.com/threads/cs-christmas-eve-prime-rib.304160/
Here you go, this stuff is bam bam.
Au Jus (Quick Version)
1 can of consommé
2 cups beet stock or broth
½ - ¾ C Red Wine
2tbs Demi Glace (Demi is just a highly concentrated low salt brown sauce. The real deal can be spendy but a good alternative (very reasonably priced) is better than bouillon but is a bit more salty than demi so you have to adjust for that).
1tbs each soy sauce & Worcestershire
Some grated sweet onion about a tbs and a crushed (whole) garlic clove
Fresh - 2 thyme sprigs, 3 sages leaves, about 1/3 inch rosemary sprig. Oh and a pinch to 2 tsp of white sugar a the end to smooth it out, just a pinch at a time though….and at the very very end.
Add all the liquid and demi and bring to a boil then low simmer (need about 20 min) to cook the wine in. Then last 5 min or so put the fresh herbs, onion and garlic in and then let them just seep in till it tastes a bit strong then use a screen spoon the remove them. Adjust the flavor of soy and worc to taste (I don’t really measure these days I just put it all in and adjust so the above is the starting place). remember to cook the Soy and Worc in if you add any more, they need some simmer time to blend in. It shouldn’t need any salt but some pepper adds if desired.
Note it will seem a strong with a little kick (when tasting with a spoon) but remember it is a layered flavor enhancer so it should be that way. When added to the meat and spuds it makes magic…..
Au Jus (the long version)
Pretty much the above except you replace the consommé with 3-4 beef ribs (shiners work great) that have been seared under the broiler and 3 cups more stock then light simmer the ribs for at least 8 hours, 12 is better (covered). Then season with the fresh as above. The seared ribs and long simmer to draw out the marrow in the bones makes this awesome, but it takes along time, so the quick version is still pretty good