French Onion Smash Burgers with Beefy French Onion Gravy

The ultimate backyard burger upgrade

There are burgers… and then there are these burgers.

If you’ve ever had a classic smash burger—the crispy edges, the juicy center, the way it melts into the bun—you already know how good they can be.

But what if you took that and layered in everything people love about French onion soup?

Rich, savory flavor.
Sweet caramelized onions.
Melty cheese.
And that deep, comforting, slow-cooked taste…

That’s exactly what we’re doing here.

These French Onion Smash Burgers with Beefy French Onion Gravy take a backyard favorite and turn it into something unforgettable. We’re talking crispy-edged burgers topped with melted Gruyère, finished with a warm spoonful of savory French onion gravy, and layered with golden, crispy onions.

Served with sweet potato fries and eaten outside with friends?

This is the kind of meal people remember.

 

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🔥 Why This Recipe Works

This burger hits every flavor and texture note:

• Crispy + juicy smash burger base

• Sweet, slow-cooked onion flavor

• Rich, savory gravy that acts like a sauce upgrade

• Melty Gruyère for that classic French onion feel

• Crispy onions for crunch

And the best part?

👉 You get all that depth of flavor without hours of cooking, thanks to Le Sauce & Co. Beefy French Onion Gourmet Gravy.

 

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🛒 Ingredients (Serves 4)

For the Smash Burgers

• 1 lb ground beef (80/20 recommended)

• Salt + black pepper

• 4 burger buns (brioche or potato buns work best)

• 4–8 slices Gruyère cheese

 

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For the French Onion Finish

• 1 pouch Le Sauce & Co. Beefy French Onion Gourmet Gravy

• 1 large onion, thinly sliced

• 1 tbsp butter or olive oil

 

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For Toppings

• Crispy fried onions (store-bought or homemade)

• Optional: arugula or butter lettuce

 

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For Serving

• Sweet potato fries (oven-baked or air-fried)

 

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👩🍳 How to Make It

Step 1: Caramelize the Onions

Heat butter or olive oil in a skillet over medium-low heat.

Add sliced onions and cook slowly for 15–20 minutes, stirring occasionally, until:

• Deep golden brown

• Soft and jammy

• Slightly sweet

👉 This builds that classic French onion flavor base.

 

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Step 2: Warm the Gravy

Heat the Beefy French Onion gravy in a small saucepan or microwave until hot.

Once your onions are caramelized, you can:
👉 Stir a spoonful of them into the gravy for extra depth (optional but amazing)

 

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Step 3: Form the Patties

Divide ground beef into 4 loosely packed balls.

Do not overwork the meat—this keeps the burgers tender.

 

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Step 4: Smash & Cook

Heat a cast iron skillet or griddle over high heat.

Place beef balls onto the hot surface and immediately smash them down with a spatula until thin.

Season with salt and pepper.

Cook for about:

• 2–3 minutes on first side (until crispy edges form)

• Flip, then immediately add Gruyère cheese

• Cook another 1–2 minutes

 

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Step 5: Toast the Buns

Lightly toast buns on the griddle or in a pan until golden.

 

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Step 6: Build the Burgers

Layer each burger like this:

• Bottom bun

• Smash burger with melted Gruyère

• Caramelized onions

• Spoonful of warm French onion gravy

• Crispy onions

• Optional greens

• Top bun

👉 Don’t be shy with the gravy—it’s the star.

 

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🍽️ How to Serve

Serve immediately with:

• Crispy sweet potato fries

• Extra gravy on the side (trust me, people will want it)

Optional:
👉 A cold drink, backyard seating, and good company

 

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💡 Pro Tips

• Use high heat → essential for that smash burger crust

• Don’t press after flipping → keeps juices inside

• Gruyère is key → it melts beautifully and fits the flavor profile

• Balance the gravy → enough to coat, not soak the bun

 

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🔄 Easy Variations

Make it extra indulgent:
Add a second patty (double smash burger)

Make it lighter:
Serve open-faced or with a lettuce wrap

Switch the protein:
Try ground turkey or chicken (still works great with the gravy)

Add a kick:
Top with pickled jalapeños or a spicy aioli

 

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🌿 Why This Is Perfect for Backyard Nights

This recipe is everything a great outdoor meal should be:

✔ Easy to cook in batches
✔ Big, bold flavor
✔ Fun and a little messy (in the best way)
✔ Feels special without being complicated

It’s casual—but elevated.
Comforting—but still exciting.

 

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🛒 Featuring Le Sauce & Co.

The real upgrade here is the Beefy French Onion Gourmet Gravy.

It delivers:

• Deep, slow-cooked flavor

• Rich onion notes

• A perfect finishing sauce for burgers

👉 No long simmering. No complicated steps. Just incredible flavor, instantly.

 

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If you’re making burgers this summer, make these.

Because once you add that rich French onion gravy on top of a crispy smash burger…

There’s really no going back.