Demi GlacePosted: July 20, 2012
There is nothing better than to deglaze a pan that you have just cooked a steak in, with demi glace.
10 lbs. veal bones
3 carrots, roughly chopped
2 onions, roughly chopped
1 white part of leek, roughly
1 Bouquet Garni
1 6-oz. can tomato paste
1. Roast the bones: Browning bones and vegetables in a roasting pan in the oven before combining them in a pot with water gives this stock a more pronounced flavor and deeper color. Veal bones have more collagen than beef bones; simmering the bones transforms the collagen into gelatin, which makes for a thicker, richer stock. Heat oven to 500°. Put bones into a roasting pan large enough to hold them in a single layer and roast until lightly browned, about 1–1 1⁄2 hours. Add carrots, onions, and leeks to the pan and spread them evenly around the bones. At Le Ferrandi and many French restaurants, they leave celery out of their stocks, as they believe it to be too assertive. Roast the bones and vegetables until they are deeply browned, about 45 minutes more.
2. Deglaze the pan: Transfer bones and vegetables to a 15–20-qt. stockpot. Place roasting pan over 2 burners on stove over medium heat. Add 3 cups water to pan; begin scraping up any browned bits from bottom of pan with a wooden spoon. These caramelized morsels of concentrated juice, called the fond—literally, the foundation—will enrich the stock. Simmer for 3 minutes; transfer liquid to pot of bones. Add bouquet garni and tomato paste. The paste will give the stock a deeper flavor and color. Cover bones with 6–8 qts. cold water; set pot over medium-high heat. Starting with cold water encourages the proteins and fats contained in bones to rise to the surface in large pieces, where they can be skimmed and discarded.
3. Simmer the stock: When the first bubbles begin to appear on the surface of the liquid, reduce heat to medium-low and maintain a very gentle simmer; a bubble should rise to the surface about once per second. Simmering slowly prevents the fat and impurities from being churned back into the stock and clouding it. The strength and concentration of your demi-glace will be determined by the length of time the stock simmers. For the minimum amount of extraction, it should simmer for at least 6–8 hours, but we recommend 12–24 hours for a richer, more gelatinous sauce. Check every few hours and add more cold water if necessary so that bones are always covered.