Step 1: Prepare the Marinade
In a medium-sized bowl, whisk together 1/4 cup olive oil, 3 tablespoons soy sauce, 2 tablespoons apple cider vinegar, 2 minced garlic cloves, 1 teaspoon smoked paprika, 1 teaspoon onion powder, 1/2 teaspoon black pepper, 1/2 teaspoon sea salt, 1/2 teaspoon red pepper flakes (optional), 1 tablespoon fresh rosemary, and 1 tablespoon fresh thyme.
Place the 1.5 to 2 pounds flank steak in a large resealable plastic bag or shallow dish. Pour the marinade over the steak, ensuring it’s fully coated. Seal the bag or cover the dish, then refrigerate for at least 1 hour (or up to 4 hours for deeper flavor).
Step 2: Preheat the Broiler
While the steak marinates, preheat your broiler to high. Adjust the oven rack to the top position, about 4-6 inches from the broiler element.
Line a broiler pan or baking sheet with foil for easy cleanup. Place a wire rack on top to allow air circulation and even cooking.
Step 3: Prepare the Steak for Broiling
Remove the steak from the marinade, letting any excess drip off. Discard the remaining marinade.
Pat the steak dry with paper towels to ensure a good sear. Place it on the prepared wire rack.
Step 4: Broil the Steak
Broil the flank steak for 5-6 minutes per side for medium-rare, or until the internal temperature reaches 130°F (54°C) on a meat thermometer. For medium, cook until the thermometer reads 140°F (60°C).
Keep a close eye on the steak to prevent burning, as broiling can cook food quickly.
Step 5: Rest and Slice the Steak
Once cooked, transfer the steak to a cutting board and let it rest for 10 minutes. This allows the juices to redistribute, ensuring a moist and tender result.
After resting, cut the steak against the grain into thin slices. This step is crucial for achieving the most tender texture.
Step 6: Serve and Enjoy
Serve your Keto-Friendly Broiled Flank Steak with your favorite low-carb sides, such as roasted vegetables, cauliflower mash, or a fresh green salad.