For the porterhouse steak, remove the fat edge of the steaks down to 6 mm. Score the remaining fat every 3 cm. Peel and halve the garlic clove.
Rub the meat well with garlic on each side. Mix the oil and pepper and brush the steaks with it. Let sit in a container with the lid closed for about 1 hour.
Sear the steaks for 1 to 2 minutes on each side, then continue cooking over medium heat. About 5 to 6 minutes per side (rare), or 7 to 9 minutes (pink).
Let the meat rest for a few minutes. Then loosen com bone and cut into slices diagonally to the grain.