" Demi-glace. There are a lot of ways to make demi-glace, but I recommend you simply take your already reduced meat stock, add some red wine, toss in some shallots and fresh thyme and a bay leaf and peppercorns, and slowly, slowly simmer it and reduce it again until it coats a spoon. Strain. Freeze this stuff in an ice-cube tray, pop out a cube or two as needed, and you are in business — you can rule the world. And remember, when making a sauce with demi-glace, don't forget to monter au beurre. Chervil, "

― Anthony Bourdain , Kitchen Confidential: Adventures in the Culinary Underbelly