01 -
Combine balsamic vinegar, minced garlic, cranberry sauce, brown sugar, red pepper flakes, salt, and olive oil in a large resealable bag. Pierce ribeye roast thoroughly with a knife, place it in the bag, seal, and massage to coat evenly. Refrigerate overnight, turning occasionally.
02 -
Set oven temperature to 175°C (350°F).
03 -
Remove roast from marinade and pat dry with paper towels to remove excess liquid. Heat vegetable oil over medium heat in a large cast iron pan. Sear roast until deep golden brown on all sides.
04 -
Add reserved marinade and beef broth to the pan, mixing to combine. Scatter fresh cranberries and thyme sprigs around the roast. Transfer pan to the preheated oven.
05 -
Roast for approximately 20 minutes per 450 g (1 lb) or until an internal thermometer reads 60°C (140°F) for medium rare.
06 -
Remove pan from oven and let the roast rest for 15 minutes before carving. Serve with pan sauce and garnish.