Flat iron steak is a tender, well-marbled cut of beef that cooks quickly over a hot grill and is easy to slice for sharing. For a steak about 1 inch thick, plan on roughly 8–12 minutes of grilling, then use a thermometer—not time alone—to judge when it is done.
Ingredients
- 1 flat iron steak, about 1½ lb (680 g) and roughly 1 inch (2.5 cm) thick
- 1 tbsp (15 ml) neutral oil, such as avocado, canola, or vegetable oil
- 1 tsp (5 g) kosher salt
- ½ tsp (1 g) freshly ground black pepper
- ½ tsp (1.5 g) garlic powder
- 1 tbsp (14 g) unsalted butter, optional, for serving
- 1 tbsp (4 g) chopped fresh parsley, optional, for serving
Instructions
- Prepare the steak and grill. Remove the steak from its packaging, pat it thoroughly dry with paper towels, and check for any loose silverskin; trim only tough, obvious pieces with a sharp knife. Rub the steak all over with the oil, then season both sides with the salt, pepper, and garlic powder. Start heating a gas grill to high, or prepare a charcoal grill with a hot direct-heat zone. Allow about 10 minutes for the grill to heat while you season the meat. The grates should be clean and hot before the steak goes on.
- Grill the first side. Put the steak over direct heat and close the lid. Grill for about 4–6 minutes without moving it, so the surface has time to brown and release from the grates. If it sticks firmly, give it another 30 seconds rather than pulling at it. Timing varies with the grill, steak thickness, and how cold the meat is when it starts cooking.
- Turn and check the temperature. Flip the steak with tongs and grill the second side for about 4–6 minutes. Begin checking the temperature after roughly 8 minutes total; insert an instant-read thermometer horizontally through the side into the thickest part, avoiding the grill and any large seam of fat. For food safety, USDA FSIS says whole cuts of beef should reach a safe minimum internal temperature of 145°F (63°C), followed by a 3-minute rest. If the steak is below that temperature, continue grilling in short intervals and check again. Do not rely on color or the clock to confirm doneness.
- Rest, then slice. Transfer the steak to a clean cutting board or warm plate and let it rest for at least 3 minutes. The temperature and juices settle during this pause. If using butter, add it on top while the steak rests, then scatter over parsley. Slice thinly across the grain, which shortens the muscle fibers and makes each piece easier to chew. Serve the slices with any juices on the board.
For a steak close to 1 inch thick, 8–12 minutes over high direct heat is a useful planning range, not a guarantee. A thinner steak may finish sooner; a thicker one may need more time or a brief finish over a cooler part of the grill. Keep the lid closed between checks to hold heat, and use the thermometer reading to decide when to take the steak off. The food-safety temperature above is the recommended minimum; lower doneness temperatures are not considered safe minimums by USDA FSIS.
Tips
- Thickness matters more than the label on the package. Flat iron steaks are not always cut to a uniform thickness. A ¾-inch (2 cm) steak can cook faster than the range given here, while one closer to 1½ inches (4 cm) may need extra time. Check the thickest section early, then check every minute or two if it needs longer.
- Keep the seasoning simple, and adjust the salt if needed. Kosher salt crystals vary by brand, and fine table salt is denser by volume. If substituting table salt, use about ½ tsp (2.5 g) rather than a full teaspoon, then season to taste. You can replace garlic powder with 1 small minced garlic clove (about 3 g), but fresh garlic can scorch over direct heat; mix it into softened butter for serving instead.
- Use a two-zone fire if flare-ups occur. A little dripping fat can briefly flame up. Move the steak to the cooler side until the flames settle, then return it to direct heat to finish. Do not leave it over sustained flames, which can blacken the outside before the center reaches temperature.
- Slice across the grain and serve promptly. Look for the direction of the long muscle fibers before cutting. Turn the steak so your knife crosses those fibers rather than following them. Cutting into thin slices after resting helps the texture; cutting too early lets more juices escape onto the board.
Serving Suggestions
Serve the sliced steak as a main course with grilled vegetables, roasted potatoes, corn, or a simple green salad. A sharp, fresh side such as tomato salad, pickled onions, or a squeeze of lemon balances the richness of the beef. For a more substantial meal, spoon the resting juices over the slices and add a green herb sauce, such as chimichurri, or a small pat of garlic-herb butter.
Flat iron is also easy to serve family-style: arrange the slices on a platter, keeping the thinner end separate if some guests prefer smaller pieces. Warm tortillas, rice, or crusty bread make useful accompaniments, and leftover slices can be added to sandwiches or grain bowls. If serving several sides, slice the steak just before bringing everything to the table so it stays warm without sitting out for long.
Variations
Use a quick dry rub. Add ½ tsp (1 g) smoked paprika and ¼ tsp (0.5 g) ground cumin to the salt, pepper, and garlic powder. These spices give the browned surface a smoky, earthy character without changing the grilling method. Keep sugar-heavy rubs off the steak for this high-heat approach, since sugar can burn before the middle is cooked.
Add a short marinade. For a more savory, tangy flavor, whisk together 2 tbsp (30 ml) olive oil, 1 tbsp (15 ml) soy sauce, and 1 tbsp (15 ml) lemon juice. Coat the steak and refrigerate it in a covered container for 30 minutes to 2 hours, then pat it dry before grilling so it browns rather than steams. This adds marinating time to the total and the soy sauce is salty, so reduce or omit the added salt.
Finish with a different topping. Instead of butter and parsley, try chopped scallions, a spoonful of salsa verde, or a little crumbled blue cheese. For a dairy-free option, use a drizzle of olive oil and fresh herbs. Add delicate toppings after cooking so they do not burn on the grill.
Storage and Reheating
Refrigerate cooked steak within 2 hours of cooking, or within 1 hour if the room or outdoor temperature is above 90°F (32°C). Store it in a shallow, covered container and use it within 3–4 days. For best texture, keep the steak in larger pieces and slice only what you plan to serve. You can freeze cooked steak in a well-sealed freezer-safe container for about 2–3 months for best quality; thaw it in the refrigerator before reheating.
Reheat slices gently in a covered skillet with a spoonful of water or broth, or warm a larger piece in a low oven until hot. Avoid prolonged high heat, which can make the meat tough. USDA FSIS recommends reheating leftovers to 165°F (74°C); check the thickest part with a food thermometer. You can also use cold, refrigerated slices in a salad or sandwich without reheating, provided they have been stored safely and used within the recommended time.
Frequently Asked Questions
How long does flat iron steak take on a gas grill?
A 1-inch-thick flat iron steak generally takes about 8–12 minutes over high direct heat, often 4–6 minutes per side. Grill heat and thickness change the timing, so start checking early and use a thermometer to establish doneness. Allow at least 3 minutes of resting time after cooking.
Should I grill flat iron steak with the lid open or closed?
Keep the lid closed for most of the cooking. A closed lid helps the grill hold a steady temperature and cooks the steak more evenly while the surface browns. Open it when turning the steak or checking its temperature, then close it again if the steak needs more time.
Do I need to marinate flat iron steak?
No. Flat iron is tender enough to grill with just oil, salt, and pepper. A short marinade is optional when you want a more pronounced flavor, but long marinating is unnecessary for this recipe. If you use an acidic marinade, keep the time modest and pat the meat dry before grilling.
Can I cook flat iron steak from frozen?
For the most even browning and predictable timing, thaw it in the refrigerator first. Cooking from frozen makes the outside harder to brown before the center warms, and the usual 8–12-minute estimate will not apply. Keep raw meat separate from ready-to-eat foods, and do not thaw it on the counter.
How can I tell which way the grain runs?
Look for the visible lines in the meat; they run in the direction of the muscle fibers. Position your knife across those lines and cut thin slices. If the grain changes direction across the steak, adjust the angle of your knife as you move through it.
Can I grill flat iron steak to medium-rare?
Many cooks prefer the texture of flat iron at a lower doneness, but temperatures below 145°F (63°C) do not meet the USDA FSIS safe minimum for whole cuts of beef. Use a thermometer and follow the 145°F minimum plus a 3-minute rest for food safety. Time estimates alone cannot confirm a particular doneness.
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Safety notes: safe minimum internal temperatures from USDA FSIS; raw and undercooked fish guidance from the U.S. FDA. Food safety notes
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