Add it to the hot broth/stock/soup, then whisk it in. Or, to make things a little easier, take some (about a cup) of the hot broth/stock/soup from the pot and whisk the demi glace into that until dissolved, then add it all back to the pot.
Oh cool. So if I made onion soup with onions and canned beef broth, I'd add this stuff to make the flavors richer and more complex? It sounds like exactly what I didn't know I needed!
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