Turn on the grill to preheat to medium-high temperature. Grease the wire rack with vegetable oil.
Prepare the sauce. Squeeze the juice out of the tomatoes and cut the pulp into small cubes. Place the tomato in a bowl, add olive oil, lemon juice, basil, capers, zest, salt, and pepper to taste, stir well. Set aside.
Wash the steaks, dry with a paper towel. Sprinkle the meat on all sides with salt, pepper, and coriander.
Place the steaks on the grill rack, fry with the lid closed for about 1-2 minutes, turn them 90 degrees, and cook for another 1-2 minutes. Flip the steaks over and cook for a couple of minutes or until cooked as desired.
Transfer the steaks to a board, cover with foil, let rest for minutes 5. Serve the steaks with sauce.