Prepare the grill for direct cooking over high heat (230º to 290ºC).
Lightly brush the steaks on both sides with the oil, and then smear the mustard on both sides. Season them evenly with the salt and pepper. Allow the steaks to stand at room temperature for 15 to 30 minutes before grilling.
Brush the cooking grate clean. To make crosshatch marks, lay the steaks on the cooking grate over direct high heat as if they were the small hands of a clock pointing to ten o’clock. Close the lid and grill for 2 minutes. Lift the steaks with tongs and rotate them so they point to two o’clock. Close the lid and let them sear for 2 minutes more. Flip each steak and continue to cook, with the lid closed, for an additional 2 to 4 minutes for medium-rare doneness. Remove from the grill and let rest for 3 to 5 minutes. Serve the steaks warm with the sauce on the side.
Brush the cooking grate clean. To make crosshatch marks, lay the steaks on the cooking grate over high heat as if they were the small hands of a clock pointing to ten o’clock. Close the lid and grill for 2 minutes. Lift the steaks with tongs and rotate them so they point to two o’clock. Close the lid and let them sear for 2 minutes more. Flip each steak and continue to cook, with the lid closed, for an additional 2 to 4 minutes for medium-rare doneness. Remove from the grill and let rest for 3 to 5 minutes. Serve the steaks warm with the sauce on the side.
