Pour 4 tablespoons of olive oil into a small mixing bowl. Don't overthink this—it can be any small bowl, even a measuring cup works fine. Add 2 tablespoons of red wine vinegar to the same bowl. Now, I'm going to ask you to do something that separates good home cooks from stressed ones: stir these together slowly. As you stir, you'll notice the oil and vinegar don't fully combine—they separate. That's completely normal and exactly what you want. The oil coats the meat while the vinegar soaks in and begins breaking down the muscle fibers. Now add 1 teaspoon of garlic powder and 1 teaspoon of smoked paprika to the bowl. Stir everything together until the powder is evenly distributed. Here's a professional tip: the vinegar will help the spices dissolve more evenly than oil alone would. You're looking for a mixture that looks slightly speckled with paprika—if you see little clumps of spice, just keep stirring for another 10 seconds. This entire step takes less than two minutes.

Remove your flank steak from its packaging and place it on a clean cutting board or large plate. Flank steak is a flat, relatively thin cut of beef. Before you do anything else, I want you to look at the meat closely and notice the grain—the lines running across the muscle. These lines tell you which direction the muscle fibers run. Here's the secret to tender flank steak: you're going to slice against the grain later, which means cutting perpendicular to those lines. This breaks up the long muscle fibers into shorter pieces, making each bite tender instead of chewy. For now, just note which direction the grain runs. You'll thank yourself later when you're slicing. Pat the steak dry with a paper towel. Any excess moisture on the surface will interfere with browning under the broiler. A dry surface means better color and texture on the finished steak.

Place your flank steak into a gallon-size resealable plastic bag—it should fit with just a little room to spare. Pour your marinade (the oil and vinegar mixture with the spices) directly over the steak. Here's where I want you to be hands-on: use your hands to massage the marinade all over both sides of the meat. This isn't wasting time—you're actively helping the flavors penetrate the meat and ensuring every surface gets coated. Rub the mixture into the steak for about 30 seconds to a minute. You'll notice the spices starting to cling to the meat. This is perfect. Now seal the bag, pressing out as much air as possible as you zip it closed. Set the bag on your counter (not in the fridge—room temperature is important here) and let it sit for exactly 30 minutes. This is the minimum time needed for the vinegar to begin breaking down the muscle fibers. If you have longer, 45 minutes is ideal, but don't go longer than an hour or the vinegar will start to make the exterior mushy. While the steak marinates, you can prep your side dish, set the table, or simply take a breath. This is built-in pause time that makes cooking feel less frantic.

Adjust your oven rack to sit approximately 6 inches directly below your broiler element. This is important—not too close to the heat source (which would char the outside before the inside cooks) and not too far away (which would cook the steak like a regular oven instead of using the intense broiler heat). Turn on your broiler to high heat. Most ovens have a broil setting that runs at around 550°F. Give it 5 minutes to preheat. While it's preheating, line a large rimmed baking sheet with aluminum foil if you have it. This is purely for easy cleanup—the foil catches drippings so you don't have to scrub your pan later. If you don't have foil, just use the sheet pan as is, or use a cast iron skillet. The small amount of extra effort here—preheating properly, lining your pan—makes the entire process feel more professional and less stressful. You're setting yourself up for success.

When your 30-minute marinating time is up, remove the steak from the bag. Let the excess marinade drip back into the bag—don't wipe the steak off. Any marinade clinging to the surface will help build flavor and color. Discard the marinade bag. Place the steak on your prepared baking sheet. Now sprinkle 2 teaspoons of kosher salt evenly over the top of the steak, then flip it and sprinkle ½ teaspoon of freshly cracked black pepper on the other side. Wait—I said salt on top, then pepper on the flip? Actually, let me clarify: season both sides with both salt and pepper. Here's why this matters: salt draws out moisture briefly, then reabsorbs it along with flavor, seasoning the steak from the inside out. If you salt too early (like the night before), the steak can become dry. But if you salt right before cooking, you get the tenderizing and flavoring benefit without the drying effect. This timing is perfect.

Carefully place your baking sheet with the steak into the preheated broiler. Set a timer for 5 minutes (for medium-rare) or 6 minutes (for medium). Close the broiler door—or leave it slightly ajar if your oven has a separate broiler drawer; follow your oven's manual if you're unsure. Here's what's happening: the intense heat from above is searing the top of the steak, creating a beautiful brown crust while the interior stays tender and juicy. You're using radiant heat, not direct contact with a hot surface, so the steak cooks evenly. Do not open the broiler door to peek. I know the urge is strong, but you'll lose heat and slow down the cooking. Trust the timer. When that timer goes off, pull the pan out carefully—it will be hot—and flip the steak to the other side.

Using tongs or two forks, flip the steak to the other side. It should have a beautiful golden-brown to dark brown color on the first side—this is what we want. Now set your timer for another 5–6 minutes on the second side. The second side might cook slightly faster than the first, so start checking at the 5-minute mark if this is your first time. This is where an instant-read meat thermometer becomes your best friend. Insert the thermometer horizontally into the thickest part of the steak, being careful not to touch bone (there isn't any, but the habit is good). Here are your target temperatures: Medium: 140–145°F – The meat is warm throughout with less pink in the center.Well-done: 150°F and above – The meat will be gray throughout and tend toward dryness, especially with a lean cut like flank.Medium-rare: 130–135°F – This is my recommendation for flank steak. The meat is tender, juicy, and has a warm red center. If you don't have a thermometer, use the touch test: the fleshy area at the base of your thumb (when your hand is relaxed) feels similar to rare steak. Touch the same spot when you press your thumb and index finger together, and it feels like medium-rare. This takes practice, but it works.

Remove the steak from the broiler and place it on a clean cutting board. This is not the time to slice it. I want you to let it rest for exactly 10 minutes. Set a timer if you need to—resting is not optional, and 10 minutes is the minimum. Here's the science: when you cook meat, the heat pushes all the flavorful juices toward the center. If you slice immediately, those juices run all over the cutting board instead of staying in your steak. After resting, the juices redistribute throughout the meat, making every bite juicy and flavorful. This 10 minutes is the difference between a good steak and a great one. While the steak rests, this is the perfect moment to plate your sides, pour water, or take a breath. You've essentially finished the hardest part.

After 10 minutes of resting, place the steak on your cutting board. Remember earlier when I asked you to notice the grain direction? Now is when that matters. Slice the steak thinly and perpendicular to the grain lines—this means cutting across those lines, not parallel to them. Use a sharp knife and make smooth, confident cuts. You're looking for slices about ¼ inch thick. Thinner slices cook more evenly and are easier to chew, especially with a cut like flank that has pronounced muscle fibers. If your knife is dragging or shredding instead of slicing cleanly, it's time to sharpen it. Arrange the sliced steak on a serving platter or individual plates. Any juices that have pooled on the cutting board should be drizzled over the top—these are liquid gold, flavor-wise.

Serve the steak while it's still warm, ideally within 5 minutes of slicing. Flank steak is best enjoyed at this temperature. Pair it with your favorite sides—I'll give you suggestions below—and enjoy the fact that you just made restaurant-quality steak at home in about 40 minutes.