Then, heat the olive oil and butter in a large heavy skillet, cast iron if you have one. Braise the pork tenderloin medallions, you may have to work in 2 batches. Cook for 2 – 3 minutes on each side, remove from the skillet and cook the remaining pork. Using 2 wooden skewers, thread meat first with one & then with the other. It should resemble the unsliced tenderloin but do leave a tiny bit of space between each piece.