1. Light the grill. White oak is a great choice for wood. Get 1/2 or a 1/3 of the grill ripping hot. Leave the other side off. Temper steak to room temperature before cooking. Season heavily with salt and pepper.
2. Bring a sauté pan to high heat. Season mushrooms with salt, sear cut side down. Place another pan on top of the mushrooms to keep them flat. Lower flame and cook until mushrooms are golden brown. Flip and add garlic, thyme and butter. Lower flame and brown mushrooms in the butter. Cook until tender, around 10 minutes. Discard garlic and thyme. Reserve mushrooms in pan.
3. Grill steak over high flame. Cross hatch on both sides. Brown edges. Move steak once seared to the cooler part of the grill and close top. Cook to desired doneness. Once cooked to desired doneness, remove from grill and rest for five minutes. Slice steak. Garnish with mushrooms, butter and balsamic. Enjoy.