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Keto Dinner

Perfect Flat Iron Steak

There's something about a perfectly seared flat iron steak that turns an ordinary weeknight into a special occasion. With a quick marinade featuring garlic, fresh herbs, and a splash of Cabernet, this keto-friendly steak comes out incredibly tender and rich every time. I love how letting the meat rest after cooking makes all the difference.

15 min Prep time 8 min Cook time 23 min Total time 4 Servings 420 Calories
Perfect Flat Iron Steak

Ingredients

  • pounds flat iron steak
  • /2 tablespoons olive oil
  • cloves garlic, minced
  • teaspoon chopped fresh parsley
  • /4 teaspoon chopped fresh rosemary
  • /2 teaspoon chopped fresh chives
  • /4 cup Cabernet Sauvignon
  • /2 teaspoon salt
  • /4 teaspoon ground black pepper
  • /4 teaspoon dry mustard powder

Instructions

  1. Step 1

    Start by placing the flat iron steak in a large resealable bag. In a small bowl, combine the olive oil, minced garlic, parsley, rosemary, chives, Cabernet, salt, pepper, and dry mustard powder. Whisk together to create a fragrant marinade, then pour over the steak. Press out as much air as possible, seal the bag, and refrigerate for at least 2 hours—the longer, the deeper the flavor. When you're ready to cook, take the steak out and let it sit at room temperature for about 20 minutes. This helps it cook evenly. Heat a nonstick skillet over medium-high heat until hot. Carefully lay the steak in the skillet and sear undisturbed for 3 to 4 minutes on the first side. Flip and cook for another 3 to 4 minutes, or until your preferred doneness. I typically aim for medium-rare, which is where flat iron steak shines. Discard any leftover marinade. Transfer the steak to a cutting board and let it rest for 5 minutes—this crucial step keeps every bite juicy. Slice against the grain and serve.

Chef's Tip

I always pat the steak completely dry before searing—moisture is the enemy of a good crust. If you have a cast-iron skillet, use it; it holds heat better and gives a restaurant-quality char.

Storage Tips

Store leftover steak in an airtight container in the fridge for up to 3 days. Reheat gently in a skillet over low heat with a splash of beef broth to keep it moist—avoid the microwave, which can make it tough.

Variation Tips

For a complete keto meal, serve with garlic butter green beans or creamy cauliflower mash. You can also swap the Cabernet in the marinade for apple cider vinegar if you prefer an alcohol-free version, or add a sprinkle of blue cheese crumbles on top for a bold finish.

Frequently Asked Questions