Makes 1 cup
From John Brenner. You'll need to start with a pan in which you've just roasted a bird or meat. Butter should be European-style for best results. Veal demi-glace is available at Trader Joe's, Gelson's, Bristol Farms and specialty food markets.
1 medium shallot, minced (about 2 heaping tablespoons)
1 cup Cognac or brandy
1/2 cup veal demi-glace
4 tablespoons very cold unsalted butter, cut into small bits
Freshly ground white pepper
1. Pour out all the fat
in the roasting pan except for about 1 tablespoon. Place the roasting pan on the stove (over 2 burners, if possible) over low heat. Add the shallots to the pan and sweat about 3 to 5 minutes.
2. Turn off the heat,
then pour in the Cognac or brandy. Increase the heat to high. Stir with a wooden spoon, scraping up all the browned bits from the bottom of the pan. Reduce the mixture until it's syrupy, about 3 minutes. Add the demi-glace, stir to incorporate.
3. Strain the sauce
into a small saucepan. Warm it on low heat until it just starts bubbling, then remove from heat and whisk in the butter, a few small bits at a time. Add salt and pepper to taste, then pour into a sauceboat and serve immediately.