There’s something truly magical about a savory marinated flank steak sandwich with charred onions. Imagine sinking your teeth into juicy, tender beef, perfectly seasoned and grilled to perfection, combined with sweet, smoky onions that dance on your palate. savory braised sausages recipe The aroma wafts through the air, teasing your senses and making it impossible to resist this flavor-packed delight.
Picture this: a casual weekend gathering where friends gather around the grill, laughter fills the air, and the sizzle of meat ignites excitement. That’s the essence of this sandwich—it’s more than just food; it’s an experience that brings people together. So let’s dive in and get ready for a culinary adventure!
Why You'll Love This Recipe
- This savory marinated flank steak sandwich is quick to prepare and bursting with flavors
- The vibrant colors and textures make it visually appealing for any gathering
- Perfect for summer barbecues or cozy family dinners, it’s versatile enough to satisfy everyone’s cravings
The moment I served this savory marinated flank steak sandwich at my friend’s barbecue, I knew it was a hit—everyone went back for seconds! For more inspiration, check out this Cheesy Garlic Chicken Wraps Recipe recipe.

Essential Ingredients
Here’s what you’ll need to make this delicious dish:
- Flank Steak: Look for a well-marbled cut for maximum tenderness; it makes all the difference in flavor.
- Olive Oil: A must-have for marinating; use high-quality extra virgin olive oil for richer taste.
- Soy Sauce: This adds depth of flavor; opt for low-sodium to control the saltiness in your marinade.
- Lemon Juice: Freshly squeezed lemon juice brightens up the flavors; bottled just won’t cut it here.
- Garlic Cloves: Freshly minced garlic gives that aromatic punch; avoid pre-minced versions if you can.
- Brown Sugar: It balances the savory elements with a hint of sweetness; don’t skip this important ingredient!
- Onions: Sweet onions are ideal for charring; they caramelize beautifully when grilled. jalapeno popper grilled cheese.
- Buns: Choose sturdy buns that can hold all those delicious toppings without falling apart.
The full ingredients list, including measurements, is provided in the recipe card directly below. honey orange glazed pork chops.
Let’s Make it Together
Prepare the Marinade: Start by combining olive oil, soy sauce, lemon juice, minced garlic, and brown sugar in a bowl. Whisk until smooth and well-blended.
Marinate the Flank Steak: Place your flank steak in a resealable bag or shallow dish. Pour the marinade over it, making sure it’s fully coated; let it marinate in the fridge for at least one hour.
Grill the Onions: Preheat your grill to medium-high heat. Slice your onions thickly and toss them in olive oil before grilling until they’re charred and caramelized—about 8-10 minutes should do.
Cook the Flank Steak: Remove the flank steak from its marinade (discarding leftover marinade) and grill over direct heat for about 5-7 minutes per side. Aim for medium-rare or to your preferred doneness.
Rest and Slice: Once cooked, take the flank steak off the grill and let it rest for 5-10 minutes before slicing against the grain to ensure maximum tenderness.
Assemble Your Sandwiches: Toast your buns slightly on the grill if desired. Layer sliced flank steak generously topped with grilled onions on each bun. Add any additional toppings you love such as arugula or spicy mayo.
This savory marinated flank steak sandwich with charred onions is not just food—it’s an experience that tantalizes your taste buds while bringing friends and family together around the table! Enjoy every bite!
You Must Know
- This savory marinated flank steak sandwich is a flavor-packed treat, perfect for summer barbecues or cozy dinners
- The marination process tenderizes the meat, while charred onions add a delightful crunch
- Serve with your favorite toppings for a truly memorable meal
Perfecting the Cooking Process
Sear the flank steak first to lock in those juices, then grill the onions while letting the meat rest. This sequence ensures each bite is irresistibly juicy and flavorful.

Add Your Touch
Feel free to swap flank steak for sirloin or add some spicy aioli for an extra kick. Customize toppings like avocado or pickled jalapeños to elevate your sandwich experience. keto avocado chocolate smoothie.
Storing & Reheating
Store any leftovers in an airtight container in the fridge for up to three days. Reheat on low heat in a skillet to keep the steak tender and juicy.
Chef's Helpful Tips
- For maximum flavor, marinate the flank steak overnight
- Use fresh herbs like cilantro or parsley for added brightness
- Avoid overcrowding the grill; it can lead to uneven cooking and soggy sandwiches
Sometimes I create this sandwich when I’m feeling nostalgic, recalling family picnics filled with laughter and delicious bites that left everyone asking for seconds.

FAQ
What cut of beef works best for this recipe?
Flank steak is ideal due to its great flavor and tenderness when marinated properly.
Can I make this sandwich ahead of time?
Yes! Prepare everything in advance and assemble just before serving for optimal freshness.
What toppings pair well with the savory marinated flank steak sandwich?
Fresh greens, avocado slices, or even spicy pickles enhance the flavor beautifully.
Savory Marinated Flank Steak Sandwich with Charred Onions
- Total Time: 35 minutes
- Yield: Serves 4
Description
Savor the flavors of a savory marinated flank steak sandwich with charred onions. This dish combines juicy, tender beef with sweet, grilled onions for a delicious experience that’s perfect for summer gatherings or cozy family dinners. Ideal for any occasion, this sandwich brings friends and family together around the table.
Ingredients
- 1 lb flank steak
- ¼ cup olive oil
- ¼ cup low-sodium soy sauce
- 2 tbsp freshly squeezed lemon juice
- 4 garlic cloves, minced
- 2 tbsp brown sugar
- 2 large sweet onions, sliced
- 4 sturdy sandwich buns
Instructions
- In a bowl, whisk together olive oil, soy sauce, lemon juice, minced garlic, and brown sugar until smooth.
- Place the flank steak in a resealable bag or shallow dish and pour the marinade over it. Seal and marinate in the fridge for at least 1 hour.
- Preheat the grill to medium-high heat. Toss onion slices in olive oil and grill for about 8-10 minutes until charred.
- Remove the flank steak from marinade (discard marinade) and grill for 5-7 minutes on each side until medium-rare or desired doneness.
- Allow the steak to rest for 5-10 minutes before slicing against the grain.
- Toast buns on the grill if desired, then assemble sandwiches by layering sliced flank steak and grilled onions. Add toppings as desired.
- Prep Time: 15 minutes
- Cook Time: 20 minutes
- Category: Main
- Method: Grilling
- Cuisine: American
Nutrition
- Serving Size: 1 sandwich (250g)
- Calories: 520
- Sugar: 6g
- Sodium: 720mg
- Fat: 30g
- Saturated Fat: 8g
- Unsaturated Fat: 18g
- Trans Fat: 0g
- Carbohydrates: 36g
- Fiber: 3g
- Protein: 32g
- Cholesterol: 80mg