Flank Steak Sandwich with Chimichurri Aioli for Ultimate Flavor

Last Updated on February 13, 2026 by Leonardo Recipes Team

There s something truly exciting about crafting a delicious sandwich that elevates a simple meal into a culinary experience. Picture this: a perfectly marinated flank steak, seared to perfection, nestled between a soft, buttery roll, topped with vibrant, pickled red onions and crispy butter lettuce. This Flank Steak Sandwich with Chimichurri Aioli isn t just any sandwich it s a flavor-packed delight that will have your taste buds dancing with joy!

What makes this sandwich stand out is its delightful chimichurri aioli a creamy blend of fresh herbs and zesty spices that takes the already juicy steak to new heights. Imagine serving this at a cozy dinner or bringing it to a weekend gathering; it s sure to impress everyone at the table. Whether it s a weeknight dinner or a special occasion, this irresistible sandwich brings together bold flavors in a way that feels both gourmet and approachable. So, let s dive into this culinary adventure and create a meal that s as satisfying as it is delicious!

Why is Flank Steak Sandwich with Chimichurri Aioli irresistible?

Flavor explosion: This sandwich is bursting with bold flavors that will make your taste buds sing.

Simplicity: Easy to prepare, it s perfect for home cooks that want to impress without the stress.

Versatility: Swap in proteins like chicken or mushrooms, and enjoy different tasty variations!

Crowd-pleaser: Ideal for gatherings, this dish is guaranteed to impress guests.

Make-ahead friendly: Prepare the aioli and pickled onions in advance for even more delightful flavor integration!

Elevate your meal with this show-stopping dish that combines both gourmet and comforting elements, perfect for any occasion!

Flank Steak Sandwich with Chimichurri Aioli Ingredients

For the Steak

• Flank Steak A lean, flavorful cut perfect for marinating; for a different texture, try sirloin instead.
• Kosher Salt Essential for enhancing flavors in the marinade; adjust regular salt slightly if using.
• Ground Pepper Adds just the right amount of spice; freshly ground black pepper gives the best flavor.
• Garlic Infuses aromatic notes into the marinade; use granulated garlic if fresh isn t available.
• Maggi Seasoning A key umami flavor enhancer; soy sauce mixed with Worcestershire is a solid substitute.
• Extra Virgin Olive Oil A healthy fat for a luscious marinade; avocado oil works as an alternate.
• Lemon Juice Adds much-needed acidity; lime juice is a great alternative for a twist.

For the Aioli

• Cilantro and Flat-Leaf Parsley Fresh herbs that add bright notes; omit cilantro for a milder taste if preferred.
• Shallot Provides a sweet onion flavor; scallions serve as an acceptable substitute.
• Jalapeno Gives the aioli a spicy kick; replace with bell pepper for a milder option.
• Oregano Adds depth; fresh is best, but dried works fine in a pinch.
• Red Wine Vinegar Contributes acidity to the aioli; apple cider vinegar can be used instead.
• Kosher Salt and Maya Adjust to your preference when seasoning the aioli.

For the Sandwich Assembly

• Italian or French Rolls Ideal for a hoagie-style sandwich; opt for gluten-free rolls if necessary.
• Red Lettuce Adds a crunchy layer and vibrant color; feel free to substitute any leafy green.
• Pickled Red Onion Provides a zingy brightness; store-bought or homemade options work well.

Dive into this Flank Steak Sandwich with Chimichurri Aioli, and get ready for a flavor experience that will elevate your meal time!

How to Make Flank Steak Sandwich with Chimichurri Aioli

1. Prepare Marinade: In a mixing bowl, whisk together the kosher salt, ground pepper, garlic, Maggi seasoning, olive oil, and lemon juice. This magical blend will infuse your flank steak with unbeatable flavor.

2. Marinate Steak: Place the flank steak into a shallow dish and generously coat it with the marinade. Cover and refrigerate for at least 30 minutes to allow the flavors to meld together while bringing it to room temperature.

3. Heat Pan: Preheat your cast-iron skillet over medium-high heat. Add a drizzle of high-heat oil to create a non-stick surface for the steak.

4. Sear Steak: Once the pan is hot, remove the garlic pieces from the steak and place it in the skillet. Sear for 5 minutes on one side, then flip and cook for an additional 3-5 minutes until the steak reaches an internal temperature of 125 °F for perfect medium-rare.

5. Rest Steak: Transfer the cooked steak to a cutting board and let it rest for 5 minutes. This step is crucial as it allows the juices to redistribute for a tender bite.

6. Make Chimichurri Aioli: In a food processor, blend cilantro, flat-leaf parsley, shallot, jalapeno, oregano, and red wine vinegar. Gradually add olive oil while processing until smooth. Season with salt to taste.

7. Prepare Buns: While the steak rests, butter the Italian or French rolls and toast them in the skillet until they re golden brown, adding extra richness.

8. Assemble Sandwich: On each toasted bun, layer crisp red lettuce, slices of flank steak, a generous dollop of chimichurri aioli, and the zingy pickled red onion. Top with the other half and serve immediately.

Optional: Add avocado slices for extra creaminess!

Exact quantities are listed in the recipe card below.

Make Ahead Options

These Flank Steak Sandwiches with Chimichurri Aioli are perfect for meal prep, allowing you to enjoy delicious, home-cooked meals even on the busiest days! You can marinate the flank steak up to 24 hours in advance to enhance its flavor and tenderness. Additionally, prepare the chimichurri aioli and pickled red onion a day ahead and store them in airtight containers in the refrigerator this not only saves time but also allows the flavors to meld beautifully. When you re ready to serve, simply sear the marinated steak, toast the rolls, and assemble the sandwich. It s a fantastic way to enjoy a gourmet meal with minimal effort!

Flank Steak Sandwich with Chimichurri Aioli Variations

Feel free to tailor this delicious recipe to your taste buds and dietary needs!

• Chicken Alternative: Swap flank steak for chicken breast, marinating and cooking it in the same way for a lighter option.
• Mushroom Swap: Use portobello mushrooms instead of steak for a hearty, plant-based alternative that s bursting with flavor.
• Fresh Veggie Boost: Add sliced avocados or ripe tomatoes for an extra layer of freshness and creaminess in each bite.
• Cheese Delight: Melt some provolone or gouda inside the sandwich, bringing extra richness to this already indulgent creation.
• Herb Variations: Experiment with other herbs like dill or basil in your chimichurri aioli for an exciting flavor twist.
• Heat Factor: Want some spice? Add sliced jalapeños directly to the sandwich or mix in more to the aioli for an extra kick.
• Bread Options: Switch out Italian or French rolls for ciabatta or sourdough for a slightly different texture and taste.
• Zesty Bouquets: Trade red wine vinegar for lemon or lime juice in the chimichurri aioli to brighten flavors and bring a refreshing zing.

Expert Tips for Flank Steak Sandwich

Rest the Steak: Always let the steak rest after cooking to allow juices to redistribute, ensuring every bite is tender and juicy.

Ventilation Matters: Use proper ventilation to avoid smoke when searing in a cast-iron skillet; consider turning on your kitchen fan or opening a window.

Marination Time: For enhanced flavor, consider marinating the steak longer than 30 minutes, even overnight, for the ultimate flank steak sandwich experience.

Slice Against the Grain: To achieve optimal tenderness, always slice the flank steak against the grain; this will result in a melt-in-your-mouth texture.

Toast Your Rolls: A quick buttering and toasting of your rolls in the skillet can elevate your sandwich, adding a rich, golden crunch that complements the fillings.

Taste as You Go: Don t forget to taste your chimichurri aioli and adjust seasoning as needed this ensures flavors are balanced and tailor-made to your liking!

How to Store and Freeze Flank Steak Sandwich with Chimichurri Aioli

• Fridge: Keep any leftover sandwich halves in an airtight container for up to 3 days. This will help maintain freshness while the flavors continue to meld.
• Freezer: If you d like to freeze assembled sandwiches, wrap each tightly in plastic wrap and then in aluminum foil for up to 1 month. Thaw overnight in the fridge before reheating.
• Reheating: When ready to enjoy, remove wrapping and heat the sandwich in a toaster oven or skillet until warmed through, ensuring the steak stays juicy and the bun gets crispy.
• Aioli Storage: Store any remaining chimichurri aioli in a sealed container in the fridge for up to 1 week. Use it as a tasty dip or sauce for other dishes!

What to Serve with Flank Steak Sandwich with Chimichurri Aioli?

Enhance your dining experience with sides that echo the bold, zesty flavors of your delicious sandwich.

• Sweet Potato Wedges: Crispy and sweet, these wedges add a delightful contrast, perfectly balancing the savory richness of the sandwich.

• Spicy Cucumber Salad: Refreshing and tangy, this salad provides a cooling effect with a bit of heat to complement the chimichurri aioli.

• Coleslaw: Crunchy and creamy, the slaw brings a tangy crunch that pairs beautifully with the tender steak, making every bite exciting.

• Grilled Vegetables: Smoky, charred veggies offer a vibrant addition that enhances the meal s gourmet feel while adding layers of flavor.

• Garlic Bread: Buttery, toasted slices enhance the entire meal with their rich taste, making for delicious dipping into any leftover aioli.

• Red Wine: A medium-bodied red wine will elevate the flavors of the steak, creating a classy pairing that s perfect for entertaining.

Flank Steak Sandwich with Chimichurri Aioli Recipe FAQs

How do I choose the right flank steak?
Absolutely! When selecting flank steak, look for a piece that is bright red and marbled with thin stripes of fat, which will add flavor and juiciness. Avoid any cuts with dark spots or discoloration, as those may indicate spoilage. Freshness is key to getting the best flavor for your sandwich!

What s the best way to store leftover sandwiches?
Very simple! Keep any leftover Flank Steak Sandwich halves in an airtight container in the refrigerator for up to 3 days. This helps maintain freshness and allows the flavors to integrate. If you re planning to enjoy them later, consider storing the filling and bread separately to prevent sogginess.

Can I freeze the sandwiches?
Absolutely! To freeze assembled Flank Steak Sandwiches, wrap each tightly in plastic wrap and then in aluminum foil. They can be stored for up to 1 month. When you re ready to enjoy, simply thaw overnight in the fridge, then reheat them in a toaster oven or skillet until warmed through, keeping the steak juicy and the bun crispy.

What should I do if my chimichurri aioli is too thick?
No problem! If your chimichurri aioli turns out too thick, add a tablespoon of warm water or extra lemon juice, blending it in gradually until you reach your desired consistency. This adds a lovely tang while ensuring it s smooth enough to spread easily on your sandwiches. Remember to re-taste and adjust the seasoning if needed!

Is there a substitute for cilantro in the aioli?
Certainly! If you re not a fan of cilantro, simply omit it and increase the amount of flat-leaf parsley for a milder flavor. You can also add a hint of basil or mint for a different herbal twist, keeping that lovely freshness balanced in your sandwich.

Can these sandwiches be made ahead of time?
Very much so! You can prepare the chimichurri aioli and pickled onions a day in advance for even better flavor integration. Just store them in separate airtight containers in the fridge. Assembly can also be done a few hours prior to serving, but for the best taste, I recommend toasting the rolls just before serving.