A Flavor-Packed, Low-Carb Burger Using Olive Oil & Balsamic

If you love the famous In-N-Out bunless burger, you know the magic comes from the caramelized onions as the bun. Sweet, savory, and slightly crispy, they create a delicious “bun” alternative that makes every bite juicy and satisfying.

This version takes it a step further by incorporating garlic infused olive oil for rich flavor and a light drizzle of balsamic vinegar to deepen the sweetness of the onions. The result is a burger that’s indulgent, bold, and incredibly satisfying—without the bread.

It’s perfect for anyone looking for a low-carb burger, an easy weeknight meal, or a new twist on a classic comfort food favorite.

Bunless Onion Burger Recipe

Ingredients

• 1 large yellow onion

• 1 tablespoon garlic infused olive oil

• 2 beef burger patties

• 2 slices American cheese or cheddar

• Salt and pepper

• 1 teaspoon traditional balsamic vinegar

• Lettuce leaves (optional)

• Tomato slices (optional)

• Pickles (optional)

Step 1: Slice the Onion “Buns”

Slice the onion into thick rings, about ½ inch thick. Choose the largest rings to act as your burger “buns.”

This is the key to recreating the viral bunless onion burger texture.

Step 2: Caramelize the Onion Rings

Heat a large skillet over medium heat and add the garlic infused olive oil.

Place the onion rings in the skillet and cook for about 4–5 minutes per side until they soften and develop a golden brown color.

During the last minute of cooking, drizzle a small amount of balsamic vinegar over the onions. This enhances their natural sweetness and gives them a rich, slightly tangy flavor.

Remove and set aside.

Step 3: Cook the Burger Patties

Increase the skillet to medium-high heat.

Season the burger patties with salt and pepper and cook until your desired doneness.

In the last minute, add cheese to melt over the patties.

Step 4: Assemble the Bunless Burger

Place one caramelized onion ring on a plate.

Add the cheeseburger patty, then layer on tomato, lettuce, or pickles if you like.

Top with another onion ring to create your bunless onion burger.

Finish with a tiny drizzle of garlic infused olive oil or balsamic for an extra burst of flavor.

Why This Burger Works

The onions become sweet and tender as they cook, forming a surprisingly satisfying bun alternative. Using garlic infused olive oil helps the onions caramelize beautifully while adding savory depth.

A touch of balsamic vinegar intensifies the flavor, balancing the richness of the beef and cheese with a subtle tang.

The result is a burger that’s juicy, flavorful, and packed with bold, savory goodness.

Optional Flavor Upgrades

Try these variations next time:

Spicy Version
Add jalapeños or chili flakes while cooking the onions.

Mediterranean Style
Top with arugula, tomato, and a drizzle of balsamic glaze.

Protein Style Bowl
Chop the burger and onions and serve over lettuce for a burger salad.