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Take the steaks out and salt them well. If you are cooking goose breasts, let them sit out a solid 30 to 45 minutes. Generally, the thinner the steak the shorter the time it needs to come to temperature. And if you make this with streaks 1/4 inch or thinner, take them right out of the fridge and into the hot pan.
Heat 2 tablespoons of butter in a large saute pan set over medium-high heat. When the butter is hot, pat the steaks dry with paper towels and lay them in the pan so they don't touch each other. Sear them, turning only once, until they are done to your liking, using the finger test for doneness. If you are using duck or goose breasts, follow my instructions for cooking a duck breast here. Put the steaks on a cutting board to rest while you make the sauce.
Make sure you have only about 2 to 3 tablespoons of fat in the pan; if you've cooked duck or goose breasts you will need to remove some. Add the shallot and saute until it begins to brown, about 2 minutes. Add the glace de viande or stock and the peppercorns and bring to a boil. Boil this down by half if you are using stock -- you need not do this with the glace, as it is already reduced.
Add the brandy, bring it to a boil and let this boil furiously until you can drag a wooden spoon through the center of the pan and watch it leave a trail. This typically takes about 2 to 4 minutes. Turn off the heat and mix in the cream. When the sauce stops bubbling, add the remaining 2 tablespoons of butter one tablespoon at a time, swirling each tablespoon in to incorporate it. Doing this should prevent the butter from separating. Serve either over or under your steaks.