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Loaded Smash Burger with Lamb, Brie, and Caramelized Onion Crema

Loaded Smash Burger with Lamb, Brie & Caramelized Onion Crema

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This smash burger recipe is the ultimate gourmet upgrade to your burger night! Made with juicy ground lamb, double-stacked patties, creamy brie cheese, herbed sautéed mushrooms, and a rich caramelized onion crema (our twist on the classic smash burger sauce recipe), every bite is packed with flavor. Forget boring burgers—this is hands-down the best smash burgers recipe for foodies who want something bold and unforgettable. If you’re searching for the best homemade burgers, this lamb smash burger checks every box.
Keyword Smash Burger Recipe
Prep Time 25 minutes
Cook Time 20 minutes
Servings 2 double-stacked burgers

Ingredients

Burgers:

  • 450 g ground lamb portioned into 5 golf ball-sized balls
  • Salt and pepper to taste
  • Brie cheese sliced
  • Butter lettuce leaves
  • Brioche burger buns
  • Unsalted butter for toasting buns
  • Canola or vegetable oil for cooking

Sautéed Mushrooms:

  • 5 cremini mushrooms thinly sliced
  • 1 sprig fresh rosemary chopped
  • 1 sprig fresh thyme chopped
  • 3 leaves fresh sage chopped
  • 1 tbsp unsalted butter
  • Splash of olive oil
  • Salt and pepper to taste

Caramelized Onion Crema:

  • ¼ cup mayonnaise
  • ¼ cup sour cream
  • 1 small onion thinly sliced
  • 2 garlic cloves minced
  • 1 tsp Worcestershire sauce
  • 1 tsp balsamic vinegar
  • 2 tsp of sugar
  • Pinch of paprika optional
  • Salt and pepper

Instructions

  • Portion lamb into 5 balls. Chill until ready to cook.
  • Make caramelized onion crema:
  • Cook onions slowly in butter over medium-low heat. Season with a pinch of salt. Once golden, add minced garlic, sugar and sautee for about a minute. Let cool. Blend with sour cream, mayo, salt, and pepper until smooth.
  • Sauté mushrooms:
  • In a hot pan, melt butter and a little oil. Add mushrooms. Let them sear for 30 seconds, then stir. Add rosemary, thyme and sage. Cook until golden. Season with salt and pepper.
  • Cook smash burgers:
  • Heat a pan over medium. Add oil. Smash each lamb ball flat using parchment paper and a spatula. Season. Cook 30 seconds, flip, season again. Top each patty with brie.
  • Stack burgers:
  • Stack two patties together with brie in between. Keep warm in a 350°F oven to melt the cheese fully.
  • Toast buns:
  • Butter buns and toast face-down in a pan until golden.
  • Assemble:
  • Spread caramelized onion crema on the bottom bun. Add lettuce, the double-patty stack, sautéed mushrooms, more crema on the top bun, and close it up. Enjoy!

Notes

  • Smash burgers cook quickly — keep an eye on them!
  • Lamb adds rich flavor but you can substitute ground beef if preferred.
  • The caramelized onion crema also makes a great dip for fries!