Using a few paper towels absorb the butter from the pan, but keep the garlic and the herbs (if not burnt). Now, we are going to flambé. Add the crushed black pepper to the pan. On high heat, but with the pan off the stove add the brandy or cognac.
Place the pan back on the stove and tilt it a bit until it catches on fire. If you have an electric stove, just use a lighter or matches. Let the fire go off and then add the stock and reduce by half.
Then add the cream and cook until the sauce thickens, and it coats the back of a spoon. You can pour the sauce right on top of the steak or serve it in a gravy boat on the side.