Mince the garlic cloves and finely chop the fresh rosemary and thyme leaves.
In a small mixing bowl, whisk together the olive oil, balsamic vinegar, minced garlic, rosemary, thyme, sea salt, and black pepper to create the marinade.
Place the flanken-style beef ribs in a shallow glass dish and pour the marinade over them, ensuring every piece is well-coated; let marinate for 30 minutes at room temperature.
Heat a large cast-iron skillet or grill pan over medium-high heat until very hot.
Place the ribs in the skillet and sear for 3 to 4 minutes per side, or until a deep brown crust forms and the meat reaches your desired level of doneness.
Remove the ribs from the pan and let them rest for 5 minutes on a cutting board.
While the meat rests, steam or lightly sauté the asparagus spears in the same pan for 3 minutes until they are tender-crisp and vibrant green.
Serve the seared ribs alongside the asparagus for a clean, protein-packed dinner.