Prepare the Garlic Sauce: Preheat your oven to 400°F (200°C). Slice the top off the head of garlic and wrap it in aluminum foil. Roast in the oven for about 30-35 minutes, or until the cloves are soft and golden. Let it cool, then squeeze the roasted garlic into a bowl and mash it into a paste.
Marinate the Steak: While the garlic is roasting, rub the bavette steak with olive oil, salt, and pepper. Allow it to marinate at room temperature for about 20 minutes to enhance the flavor.
Cook the Steak: Heat a heavy skillet or grill pan over medium-high heat. Once hot, add the bavette steak and sear for about 4-5 minutes on each side for medium-rare, depending on the thickness. Remove the steak from the pan, cover with foil, and let it rest for 5-10 minutes.
Make the Sauce: In the same pan, reduce the heat to medium and add the butter. Once melted, stir in the roasted garlic paste, thyme, and Dijon mustard. Pour in the balsamic vinegar and beef broth, scraping any browned bits from the bottom of the pan. Let it simmer for about 5 minutes until slightly thickened.
Slice and Serve: Slice the bavette steak against the grain into thin strips. Spoon the roasted garlic sauce over the sliced steak and garnish with chopped parsley.
Notes
Serve with roasted vegetables or a fresh salad for a complete meal.