Blackstone Griddle Flank Steak (Juicy, Restaurant-Quality in 10 Minutes)

Blackstone Griddle Flank Steak turns one of the most underrated, budget-friendly cuts of beef into a deeply seared, juicy steakhouse dinner in about 10 minutes of cook time. The flat-top’s screaming-hot surface gives flank steak the wide, even crust it craves — something a standard grill grate can’t fully deliver — while a simple marinade does the heavy lifting on flavor and tenderness.

If you’ve ever ended up with chewy, gray, disappointing flank steak, this guide fixes every common mistake: the right temperature, when to flip, how long to rest, and the one slicing trick that makes the biggest difference between tough and tender.

Why You’ll Love This Recipe

• Fast. Flank steak is thin, so it cooks in roughly 8–10 minutes total — perfect for weeknights.
• Budget-friendly. Flank delivers big, beefy flavor for a fraction of the price of ribeye or strip.
• Incredible crust. The Blackstone’s flat surface keeps the entire steak in contact with the heat, so you get an edge-to-edge sear, not just grill-mark stripes.
• Endlessly versatile. Slice it for tacos, fajitas, rice bowls, salads, sandwiches, or serve it as a classic steak dinner.

What Is Flank Steak?

Flank steak is a long, flat, lean cut from the cow’s lower abdominal muscles. It’s prized for its rich, beefy flavor and has a very pronounced, visible grain — long muscle fibers running in one direction. Because it’s lean and those fibers are tough when undercooked or overcooked, flank steak rewards two things above all: cooking it hot and fast to no more than medium, and slicing it thinly against the grain. Get those right and a $12 cut eats like something far more expensive.

It’s often confused with skirt steak, and the two are interchangeable in most recipes — skirt is a touch fattier and more intensely beefy, while flank is leaner and slightly more tender.

Can You Cook Flank Steak on a Blackstone Griddle?

Absolutely — and arguably better than on a traditional grill. A Blackstone’s flat, evenly heated steel surface puts the whole steak in full contact with the heat, building a uniform, mahogany crust (the Maillard reaction) across the entire cut. There are no grates for flavorful juices to drip through and flare up, which means a more even sear and zero charred hot spots. Flank steak’s thin profile is ideally suited to this kind of high-heat, fast cooking.

Ingredients

Exact amounts are in the printable recipe card at the bottom of the post.

For the steak:

• Flank steak (about 1 to 1.5 lbs). Look for an even thickness and good red color.
• Kosher salt and freshly ground black pepper. Season generously; flank can take it.
• High-heat oil (avocado, canola, or vegetable oil) for the griddle surface. Olive oil works but has a lower smoke point.

For the marinade (highly recommended):

• Soy sauce adds salt and umami that also help the crust.
• Olive oil carries flavor and keeps the lean meat moist.
• Worcestershire sauce gives a deep, savory backbone.
• Garlic, minced, for an aromatic punch.
• Brown sugar or honey balances the salt and boosts browning.
• Lime or lemon juice. A little acid tenderizes and brightens.
• Smoked paprika, cumin, or red pepper flakes for optional warmth and smokiness.

For serving (optional):

• Chopped fresh parsley or cilantro
• Lime or lemon wedges
• Sautéed onions, peppers, or mushrooms

The Best Flank Steak Marinade

Whisk together:

• 1/3 cup soy sauce
• 1/4 cup olive oil
• 2 tablespoons Worcestershire sauce
• 3 cloves garlic, minced
• 1 tablespoon brown sugar (or honey)
• Juice of 1 lime
• 1 teaspoon smoked paprika
• 1/2 teaspoon black pepper

Add the steak to a zip-top bag or shallow dish, pour the marinade over, and refrigerate. Marinate 30 minutes minimum, or 2 to 8 hours ideally. Don’t go past 24 hours, because the acid will start to break the surface down and turn it mushy.

How to Cook Flank Steak on a Blackstone Griddle

Step 1: Remove the steak from the marinade and pat it completely dry with paper towels. A dry surface is non-negotiable for a good sear. Let it sit out for 20 to 30 minutes so it cooks evenly.

Step 2: Heat your Blackstone to medium-high, around 400 to 450°F, for a full 10 to 15 minutes. You want it genuinely hot; a drop of water should sizzle and dance instantly.

Step 3: Drizzle a thin layer of high-heat oil onto the steel and spread it. Season both sides of the steak with salt and pepper (go light on salt if your marinade had soy sauce).

Step 4: Lay the steak down and leave it alone for 3 to 4 minutes. You should hear an aggressive sizzle. Resist the urge to move it, because that contact time is what builds the crust.

Step 5: Flip with tongs (never a fork, since piercing lets juices escape) and sear the second side another 3 to 4 minutes.

Step 6: Pull the steak with an instant-read thermometer at:

• 125°F for rare
• 130 to 135°F for medium-rare (recommended)
• 140 to 145°F for medium

Temperature will climb about 5°F while resting, so pull it a few degrees early.

Step 7: Move the steak to a board and let it rest 5 to 10 minutes, loosely tented with foil. This lets the juices redistribute instead of pouring out the moment you cut.

Step 8: Find the direction the muscle fibers run, then slice thinly and perpendicular to them at a slight angle. This shortens the fibers and is the single biggest factor in tenderness. Cut with the grain and even a perfectly cooked flank will be chewy.

Flank Steak Doneness & Temperature Chart

Doneness	Pull Temp	Final Temp (after rest)
Rare	120°F	125°F
Medium-Rare (best)	125 to 130°F	130 to 135°F
Medium	135 to 140°F	140 to 145°F
Medium-Well	145 to 150°F	150 to 155°F

Because flank is lean, going past medium dries it out quickly. Medium-rare is the sweet spot.

Pro Tips for the Best Griddle Flank Steak

• Dry the surface. Moisture steams instead of sears. Pat it bone-dry.
• Get the steel hot first. A lukewarm griddle gives you gray, tough meat with no crust.
• One flip only. Let each side develop a full crust before turning.
• Tongs, not forks. Keep the juices in the meat.
• Always rest, always slice against the grain. These two free steps make the biggest difference.
• Watch the clock, not just the color. Flank is thin and overcooks fast, so a thermometer is your safety net.

What to Serve With Flank Steak

• Crispy Blackstone smashed potatoes for a hearty, golden side
• Blackstone fried rice or sweet, charred Blackstone corn on the cob
• A crisp citrus salad to cut the richness (see more Blackstone side dishes for ideas)
• Warm tortillas for tacos, paired with seasoned Blackstone griddle taco meat for taco night
• Charred Blackstone griddle zucchini, or sautéed peppers, onions, and buttery mushrooms right on the flat top

Storage & Reheating

Refrigerate leftover sliced steak in an airtight container for up to 3 to 4 days. Freeze for up to 3 months. To reheat without overcooking, warm slices quickly in a hot skillet with a splash of broth, or microwave gently in short bursts. Leftover flank is fantastic cold in salads or grain bowls, too.

Recipe Variations

• Carne asada style: Add orange juice and extra cumin to the marinade; serve in tacos.
• Asian-inspired: Lean into the soy, add ginger and sesame oil, finish with scallions over rice.
• Steakhouse: Skip the marinade, season only with salt and pepper, and finish with a pat of compound herb butter.
• Spicy: Add chipotle in adobo or extra red pepper flakes to the marinade.

Frequently Asked Questions

What temperature should the Blackstone be for flank steak? Medium-high, about 400 to 450°F. Hot enough for a fast, deep sear without overcooking the thin cut before the inside is done.

How long do you cook flank steak on a griddle? Roughly 3 to 4 minutes per side for medium-rare, depending on thickness. Always confirm with a thermometer rather than time alone.

Should I marinate flank steak? It’s highly recommended. Flank is lean and benefits from a marinade for both flavor and tenderness. Thirty minutes helps, but 2 to 8 hours is ideal. Don’t exceed 24 hours.

How do I keep flank steak from being tough? Three rules: don’t cook past medium, rest it before cutting, and always slice thinly against the grain. Overcooking and cutting the wrong direction are the usual culprits.

Can I cook frozen flank steak on a Blackstone? Thaw it fully first. Cooking from frozen leads to uneven results and a poor crust.

Can I reuse the marinade as a sauce? Not the raw marinade, since it touched raw beef. Make a fresh batch and simmer it separately if you want a sauce.

What’s the difference between flank and skirt steak? They’re close cousins and usually interchangeable. Skirt is slightly fattier and more intensely beefy; flank is leaner and a bit more tender. Both must be sliced against the grain.

Can I cook vegetables on the griddle at the same time? Yes. Peppers, onions, and mushrooms cook beautifully alongside the steak for an easy one-surface meal.

More Blackstone Beef & Steak Recipes

• Blackstone Sirloin Steak: a thicker, full-cut steak seared to juicy perfection on the flat top.
• Blackstone Steak Bites: tender garlic-butter cubes that work as a main, taco filling, or party appetizer.
• Blackstone Philly Cheesesteak: thinly sliced steak, peppers, onions, and melty cheese piled into a hoagie.
• Blackstone Beef Kabobs: marinated steak and colorful veggies on skewers.
• Blackstone Griddle Taco Meat: bold, seasoned beef ready for taco night in minutes.
• Blackstone Loaded Grilled Nachos: a crowd-pleasing way to turn griddled beef into a shareable plate.