Flank Steak Recipe Oven: Tender Herb-Infused Slices With Caramelized Crust

This oven-baked method transforms flank steak into tender slices with a deeply caramelized crust. The key lies in a high-heat sear followed by precise oven finishing.

Herb-infused marinade ensures every bite is packed with flavor, while proper slicing against the grain guarantees the promised tender texture. Simple technique, impressive results.

Ingredients for Flank Steak Recipe Oven

Quality ingredients create that caramelized crust and tender texture every time.

The flank steak is non-negotiable for this method. Look for 1-inch thickness at the butcher counter—thinner cuts overcook easily. Whole Foods and Costco consistently carry well-marbled pieces. For the herbs, organic rosemary and thyme from the refrigerated section outperform dried. Their essential oils release more effectively during the marinating process (worth the extra dollar, honestly).

No fresh herbs? Dried at one-third the amount, but rehydrate in warm water first. Soy sauce can be swapped for tamari (gluten-free) or coconut aminos for a milder taste. Worcestershire sauce adds depth if you have it—just 1 tbsp. The balsamic vinegar can be replaced with red wine vinegar in a pinch, though the caramelization won’t be as pronounced (still tasty).

Marinate the steak for 4-12 hours—overnight is ideal but not mandatory. The cooked steak rests beautifully for 10-15 minutes before slicing. Leftovers? Slice thin, store in airtight containers for 3-4 days. Reheat gently to preserve that prized tenderness.

Instructions

Here’s the method I use to achieve tender, herb-infused results with a caramelized crust.

Step 1: Prepare the Herb Marinade

In a medium bowl, whisk together the 0.5 cup soy sauce, 0.25 cup olive oil, 2 tbsp balsamic vinegar, 1 tbsp Dijon mustard, 1 tbsp brown sugar, 1.5 tsp kosher salt, 1 tsp black pepper, and 0.5 tsp red pepper flakes until fully combined. The sugar should dissolve completely into the liquid mixture.

Next, finely chop the 2 tbsp fresh rosemary and strip the leaves from the 2 tbsp fresh thyme stems. Add these to the bowl along with the 4 cloves garlic cloves, minced. Stir thoroughly to distribute the herbs and garlic evenly throughout the marinade.

Step 2: Marinate the Flank Steak

Place the 2 lb flank steak in a large, shallow dish or resealable plastic bag. Pour the prepared marinade over the steak, ensuring it’s completely submerged. Use your hands to massage the marinade into the meat, making sure all surfaces are well coated.

Cover the dish or seal the bag and refrigerate for at least 4 hours, preferably overnight. This extended marinating time allows the acidic components to begin tenderizing the flank steak while the herbs infuse it with deep, aromatic flavors.

Step 3: Sear and Finish in the Oven

Preheat your oven to 400°F. Remove the steak from the marinade (reserve the marinade) and pat it dry with paper towels. This step is crucial for achieving a good sear. Heat an oven-safe skillet over high heat until very hot.

Add the steak to the skillet and sear for 3-4 minutes per side until a deep brown crust forms. Transfer the skillet to the preheated oven and cook for 8-10 minutes for medium-rare, or until the internal temperature reaches 135°F.

Step 4: Rest and Slice Against the Grain

Transfer the steak to a cutting board and let it rest for 10 minutes. This resting period allows the juices to redistribute throughout the meat. Meanwhile, you can reduce the reserved marinade in the skillet over medium heat for 5 minutes to create a quick pan sauce.

Slice the steak thinly against the grain at a slight angle. This cutting technique shortens the muscle fibers, ensuring maximum tenderness. Serve immediately with the reduced marinade spooned over the slices, or reserve for other uses.

Common Mistakes When Making This Dish

Skipping the Marinating Time

I’ve learned the hard way that 4 hours minimum is non-negotiable for flank steak. The acidic components in the marinade need time to break down the tough muscle fibers. Even 30 minutes makes a noticeable difference, but overnight delivers the most tender results. 💡

Overcrowding the Skillet

When searing, use a skillet large enough to give the steak space. Crowding causes steaming instead of browning, and you’ll lose that prized caramelized crust. I use my 12-inch cast iron for 2 lb steaks to ensure even contact with the hot surface.

Not Patting Dry

Wet steak won’t sear—it’ll steam. Always pat the marinated steak very dry with paper towels before it hits the skillet. This small step makes the difference between a gray, boiled look and a deep, glossy crust.

Slicing With the Grain

Flank steak’s muscle fibers run long and lean. Slicing with the grain leaves them intact, resulting in chewy bites. Always slice thin and against the grain at a slight angle. I angle my knife about 45 degrees for the most tender slices.

Skipping the Rest

Resting isn’t optional—it’s essential. Cutting into the steak too soon lets all those flavorful juices spill onto the cutting board. Give it a full 10 minutes under foil. The internal temperature will also rise 5-10°F during this time. 🔥

Overcooking in the Oven

Flank steak is lean and cooks quickly. Pull it from the oven at 135°F for medium-rare. Use a meat thermometer—guessing leads to dry, tough meat. I check the thickest part to be sure.

Frequently Asked Questions