Preheat the oven to 180 degrees. Peel the oranges and cut them into slices. Place the meat side by side on a platter. Drizzle with cognac. Laying on top of each other. Let stand in the refrigerator for 1/2 hour.
Let the butter fat get smoky hot in the pan. Add the steaks and fry for 1 1/2 minutes on each side. Then put the meat out of the pan in the hot oven (a steak should rest for at least 5 minutes before it is cut). Salt and pepper only before serving.
Now add the butter and the orange slices to the roast and leave them covered for approx. 4 minutes, then add to the meat. In the roast residue, let the second portion of cognac boil for a few minutes on a high flame and pour over the meat before serving.