The Best BBQ Beef Flank Steak with Caramelized Onions

Is there anything better than a juicy steak that’s healthy, flavorful, and helps you feel great?

 If you’ve been searching for the best BBQ beef flank steak recipe to kickstart your weight loss journey and help you fit better into your favorite clothes, you’re in the right place.

BBQ Beef Flank Steak

Small changes, like swapping out high-calorie meals for a lean cut of beef like flank steak or hanger steak, can make all the difference in how you feel and look.

This zero-point WW dinner recipe for BBQ Beef Flank Steak with caramelized onions is one of my favorite recipes. It features a good marinade made with Worcestershire sauce that infuses the meat with a wonderful flavor. 

You’ll love the way this thin cut of meat transforms into a tender, juicy steak with great flavor after being cooked on a preheated grill.

One of the best ways to ensure a flavorful result is by letting the steak rest after grilling and slicing it against the grain at a 45-degree angle. 

After marinating the steak in a large resealable bag, simply place it on a hot grill or grill pan until grill marks appear and the medium-rare steak is ready. Pair it with grilled onions for a delicious dinner that feels indulgent but fits perfectly into your healthy recipes lineup.

Whether it’s your first time trying this piece of flank or you’re a pro at cooking steak fajitas or other Mexican recipes, this beef flank steak marinade recipe will become one of your favorite ways to enjoy a flavorful cut of beef.

With tips like using a sharp knife to slice steak into thin slices on a cutting board, you’ll master the art of cooking this healthy dinner.

In recent years, dishes like this have become a love language for food lovers aiming to eat healthier. From a gas grill to a grill pan, there are so many different ways to cook this versatile steak.

Whether you’re trying this best grilled flank steak for dinner or pairing it with recipes breakfast ideas the next day, this recipe is sure to keep you energized and on track.

Why this recipe works...

Weight Watcher Friendly - This delicious Barbecue Beef Flank Steak recipe is 0 WW Points on my WW app.

Since the new Weight Watchers plan is personalized you will have to input the ingredients used into your WW app to get your exact WW personal points.

Easy to Make - This marinated skirt steak dinner comes together in less than 30 minutes and only uses 5 ingredients.

Ingredients

Here’s what you’ll need to make this super easy grilled flank steak with caramelized onions. See exact measurements in the recipe card below:

Uncooked Lean Flank Steak - Cooking with lean flank steak is a delicious way to enjoy a high-protein, low-fat meal that supports muscle growth and weight management.

Beef Bouillon Cubes - For enhancing flavor by adding a concentrated, savory richness that complements the natural taste of the meat.

Worcestershire Sauce - For tenderizing the meat while adding a deep, umami-rich flavor with hints of tanginess, sweetness, and spice, enhancing the steak's overall taste profile.

Tools Needed...Indoor Grill Pan

How to Make Grilled BBQ Beef Flank Steak

1: In a mini food processor crush your beef bouillon cubes into a fine powder. If you do not have a mini food processor you can use a mortar and pestle.

2: In a medium bowl add the Worcestershire sauce, salt, beef bouillon powder and 6 tablespoons of water to make a thin marinade.

3: Place your uncooked flank steak in a Gallon size Ziplock bag and add the marinade on top. Seal the bag closed and let marinate for a minimum of 10 minutes.

4: Slice your onion into ½ inch thick half-moons size.

5: Coat your grill pan with non-stick spray and heat over medium high. Place your marinated flank steak in the center of the pan. Scatter onions around steak. Cook turning once or twice, until onions are wilt slightly and char deeply in spots and steak is charred and cooked to desired doneness, 4-6 minutes.

6: Transfer steak and onions to a cutting board. Let steak rest for 10 minutes. Thinly slice steak against the grain, Serve with onions.

Watch the How to Make Grilled Flank Steak Video Here...

Expert Tips

• Choose the Right Cut: Select a high-quality, well-trimmed flank steak for the best results. Look for a bright red color and minimal visible fat.
• Marinate for Tenderness: Use an acidic marinade with ingredients like Worcestershire sauce, citrus juice, or vinegar to tenderize and enhance flavor. Allow the steak to marinate for at least 30 minutes or up to 8 hours.
• Pat Dry Before Grilling: Remove excess marinade and pat the steak dry with paper towels to prevent steaming and encourage a proper sear.
• Preheat the Grill: Preheat your indoor grill pan over medium-high heat until it’s hot enough that water droplets sizzle when splashed on the surface.
• Use Oil Sparingly: Lightly oil the grill pan or brush the steak with a small amount of high-smoke-point oil, like avocado or grapeseed oil, to prevent sticking.
• Season Generously: Sprinkle both sides of the steak with salt and pepper (or other preferred spices) just before grilling.
• Cook with Care: Grill the steak for 3–5 minutes per side for medium-rare, or until it reaches your desired doneness. Use a meat thermometer for accuracy (130–135°F for medium-rare).
• Let It Rest: Allow the steak to rest for 5–10 minutes after grilling to redistribute the juices and ensure a tender bite.
• Slice Against the Grain: Cut the steak into thin slices against the grain to make it more tender and easier to chew.
• Keep Ventilation On: Use a vent or fan to manage smoke and odors in your kitchen during grilling.

Storage Tips

• Cool Quickly: Let the steak cool to room temperature within 2 hours to prevent bacterial growth.Store Properly: Place leftover steak in an airtight container or wrap it tightly in plastic wrap or aluminum foil to keep it fresh.Refrigerate or Freeze: Store in the refrigerator for up to 3–4 days or in the freezer for up to 3 months. Label and date the storage container for easy tracking.

Ideas for using leftover steak..

• Steak Salad: Toss thinly sliced steak over a bed of greens with your favorite veggies, nuts, and a light vinaigrette.
• Steak Tacos: Use the steak in soft tortillas with fresh salsa, guacamole, and shredded lettuce for quick tacos.
• Steak Stir-Fry: Add steak strips to a veggie-packed stir-fry with a soy or teriyaki sauce.
• Steak Sandwich: Layer slices on whole-grain bread with caramelized onions, arugula, and horseradish sauce.
• Breakfast Hash: Combine steak pieces with diced sweet potatoes, peppers, and eggs for a hearty breakfast.
• Grain Bowl: Create a nutritious bowl with quinoa or brown rice, roasted vegetables, and steak slices.
• Philly Cheesesteak Wrap: Add steak, sautéed peppers, onions, and melted cheese to a whole-wheat wrap.
• Steak Soup: Dice steak and add it to a vegetable or noodle soup for added protein and flavor.
• Steak Pasta: Mix into a light pasta dish with cherry tomatoes, spinach, and olive oil.
• Pizza Topping: Use sliced steak as a topping for homemade flatbread or pizza with your favorite veggies and cheese.

Are you a Weight Watcher?

If you follow my Blog you probably already know I am a lifetime member of Weight Watchers and I like to point all of my Recipes with the WW Points System.

This Weight Watchers friendly BBQ Flank Steak recipe is 0 Points on my Weight Watchers points app for one 4 ounce serving.

Weight Watchers has a new individualized program right now to make it easier to enjoy the foods you love and still lose weight.

Just plug the ingredients into your WW app to confirm the points for your individual program.

If you want to see the old Purple, Blue and Green WW Food Lists for each plan just click Here… For a list of the 2025 Free WW Food list click here..

Make sure you check out my Newbie WW Tips and Tricks Guide if you are just getting started.

I used to go back and forth between the Purple Plan and the Blue Plan prior to the new program and whenever I hit a plateau I did my own 30 Day Low Carb Meal Plan which jumpstarts the Fat Burning again, so if you feel stuck try it!

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If you are impatient like me... blog visitors can get the New Year's special instant access to the digital download version today for only $2.97 just click here...

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