04Heat the oil in a nonstick skillet large enough to hold the slices in one layer. When the oil is hot add the slices of meat and cook over medium-high heat about 5 minutes or until browned. Turn the slices and cook about 5 minutes more. Reduce the heat and continue cooking for about 2 minutes longer. Transfer the meat to a warm serving platter. Keep warm.05In the same skillet, add the shallots and cook, stirring, until wilted. Add the reserved marinade and cook, stirring and scraping the bottom. Add any juices that have accumulated from the platter. Scrape the bottom with a wooden spatula and cook until the marinade is reduced to 3/4 of its original quantity. Swirl in the butter and pour the sauce over the medallions. Remove the bay leaf and thyme sprigs before serving.