A juicy, flavorful Flat Iron Steak recipe for the grill that turns out perfectly every time. Learn how to cook it like a pro with clear, practical tips.
What is Flat Iron Steak?
Flat iron steak comes from the shoulder (chuck) of the cow. Although it’s from a working muscle, removing the tough connective tissue leaves a surprisingly tender, well-marbled cut.
It offers excellent beefy flavor—similar to ribeye but usually at a better price—and is versatile enough for grilling, pan-searing, or broiling. For the best texture, cook over high heat and slice thinly against the grain.
Flat iron is one of the most tender steaks after filet mignon, making it a smart choice when you want a balance of tenderness, flavor, and value.
Here’s What You Need
This straightforward Flat Iron Steak recipe is kept simple and served with a bright, flavor-packed green sauce called aji verde. Gather the ingredients and tools below to get started.
Flat Iron Steak Recipe Ingredients
- Flat iron steak: See substitutes below if you can’t find it.
- Cooking oil: Use an oil with a high smoke point for searing—avocado oil, light olive oil (not extra virgin), canola, or vegetable oil.
- Coarse salt and black pepper: Kosher salt and freshly cracked pepper bring out the meat’s flavor and help form a crust when seared.
Substitutes for Flat Iron Steak
If flat iron isn’t available, try one of these cuts:
- Hanger steak: Comparable tenderness and a pronounced beefy flavor.
- Skirt steak: Slightly chewier but great for quick, high-heat cooking.
- Flank steak: Leaner and a bit tougher; slice thin against the grain.
- Ribeye: More expensive but similarly rich and tender.
Cook these similarly to flat iron but adjust times based on thickness and your target doneness.
Tools Needed
Minimal tools required:
- Gas or charcoal grill, grill pan, or a very hot cast-iron skillet.
- A brush and a small bowl for oil.
- Cutting board and a sharp knife for slicing against the grain.
How to Make Flat Iron Steak: An Easy Guide
Step-by-step method to get excellent results at home.
Prepare the sauce
Combine the aji verde ingredients in a food processor or blender. Pulse until mostly smooth but still slightly textured.
Prepare the steak
Brush both sides of the steak lightly with oil, then season generously with coarse salt and freshly cracked black pepper.
Grill the steak
Preheat your grill or pan until very hot. Place the steak on the surface and let it sear without moving it until it releases easily when lifted with tongs. That ensures a good crust and clear grill marks.
Flip and continue cooking until the internal temperature reaches about 125°F for medium-rare (remove about 5°F shy of your target to allow for carryover cooking).
Rest and serve
Transfer the steak to a cutting board and tent lightly with foil. Rest for about 5 minutes so juices redistribute. Slice thinly against the grain and drizzle with the green sauce before serving.
Internal Temperature for Doneness
Use an instant-read thermometer for accuracy. Remove the steak when it’s about 5°F below your target because it will continue to cook as it rests.
Rare: 120–125°F
Medium-rare: 130–135°F
Medium: 140–145°F
Medium-well: 150–155°F
Well-done: 160°F+
5 Common Mistakes to Avoid
Watch for these pitfalls to ensure a tender, juicy steak:
- Overcooking: Aim for medium-rare to keep the meat tender.
- Skipping the rest: Resting preserves juices—don’t skip it.
- Under-seasoning: Be generous with salt and pepper.
- Cooking on a cold surface: Preheat your grill or pan until very hot for proper browning.
- Cutting with the grain: Always slice against the grain for tenderness.
Make Ahead and Storage
Store cooked flat iron steak in an airtight container in the refrigerator for up to 3 days. Reheat gently in a skillet over low heat to avoid overcooking. You can also freeze leftovers for later use in sandwiches, salads, or tacos—thaw before reheating.
How to Serve This Flat Iron Steak
Top sliced steak with a creamy aji verde or any bright herb sauce. Other great options include garlic butter or chimichurri. Pair with creamy mashed potatoes, cornbread casserole, roasted or sautéed vegetables, or pan-fried asparagus.
Leftover steak slices work well in sandwiches, salads, or tacos.
Final Notes & Pro Tips
Practical tips to improve results:
- Be patient while searing: Let the steak develop a crust before flipping.
- Consider a marinade: An acidic marinade (balsamic, citrus) can add flavor and help tenderize if desired.
- Use a thermometer: It’s the most reliable way to hit your preferred doneness.
- Resting matters: Resting ensures a juicier steak when sliced.
- Slice against the grain: This shortens muscle fibers and maximizes tenderness.
FAQs About Flat Iron Steak
Quick answers to common questions:
Yes. Flat iron steak is prized for its tenderness and is excellent for grilling and searing.
Yes. It can be eaten rare, but medium-rare is often the best balance of texture and flavor.
Generally yes—flat iron has finer grain and good marbling, which makes it more tender than many sirloin cuts.
Aim for about 125°F for medium-rare and use an instant-read thermometer in the thickest part of the steak.
Yes. Flank, skirt, hanger, or ribeye can substitute—adjust cooking time and slicing method as needed.
Other Steak Recipes You’ll Love
Explore other ways to enjoy beef: stir-fries, Instant Pot steaks, Salisbury steak, or steak benedict variations for different occasions.
Ingredients
For Steak
- 1 lb flat iron steak
- 1 tbsp vegetable oil
- 1 tsp kosher salt
- 1/4 tsp black pepper
For Sauce
- 1/2 cup fresh cilantro
- 1/2 cup fresh parsley
- 3 garlic cloves
- 2 small green chilies (or 1 jalapeño)
- 1/2 lime, juiced
- 3/4 tsp coarse salt
- 1/4 cup olive oil
- 1/3 cup mayonnaise
Instructions
Grill the Steak
- Preheat grill or grill pan over high heat for 5–10 minutes.
- Brush both sides of the steak with oil and season generously with salt and pepper.
- Grill over direct heat until well seared on the first side. Don’t flip until the steak releases easily when lifted.
- Flip and cook until internal temperature reaches about 125°F for medium-rare (remove 5°F shy of your target to allow for carryover).
Make the Aji Verde
- Add all sauce ingredients to a small food processor or blender and pulse until mostly smooth with some texture remaining.
Rest + Serve
- Transfer steak to a cutting board, tent loosely with foil, and rest for 5 minutes.
- Slice thinly against the grain and serve with the green sauce drizzled over the top.
Notes
- If you don’t have a grill, a preheated cast-iron skillet will give excellent results—make sure it’s very hot.
- Season well and don’t skip the resting period to keep the steak juicy.
- Substitute cuts (hanger, skirt, flank, ribeye) can work—adjust cook times and slicing technique for each.
Nutrition (approx.)
Calories: 492 kcal | Carbohydrates: 3 g | Protein: 22 g | Fat: 43 g