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In-N-Out Style Lettuce Wrap Burgers with Caramelized Onions and Secret Sauce Recipe

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4.4 from 88 reviews

Enjoy the classic flavors of In and Out Burger right at home with these tasty and easy-to-make Lettuce Wraps. Juicy ground beef patties brushed with mustard, topped with caramelized onions, fresh tomatoes, pickles, cheddar cheese, and a signature secret sauce, all wrapped in crisp lettuce leaves for a low-carb twist on a diner favorite.

  • Total Time: 1 hour
  • Yield: 4 servings

Ingredients

Caramelized Onions

  • 2 yellow onions
  • 1 tbsp avocado or olive oil
  • Sea salt to taste

Burgers

  • 1 pound ground beef, shaped into 4 patties about 3/4" thick
  • 4 slices cheddar cheese (see notes, omit for dairy free and Paleo)
  • 8 leaves green leaf lettuce, washed and dried (or 2 small heads iceberg if preferred)
  • 2 tomatoes, sliced (10 ounces total)
  • 4 dill pickles, thinly sliced
  • 2 tsp yellow mustard

Secret Sauce

  • 1/4 cup mayonnaise (preferably avocado oil mayo)
  • 2 tbsp ketchup (sugar free recommended)
  • 1 tbsp pickle relish or minced dill pickle (for sugar free)
  • 1/2 tsp white wine vinegar
  • Optional: maple syrup or coconut aminos to taste

Instructions

  1. Prepare the Caramelized Onions: Heat a large 10" pan over medium heat. Dice the onions into 1/2" pieces or slice into half-moons. Add 1 tbsp of avocado or olive oil to the heated pan, then add the onions. Cook over medium or medium-low heat, stirring occasionally, until the onions soften and brown, about 20-30 minutes. Season with sea salt to taste. Set aside approximately 1 cup of caramelized onions.
  2. Preheat Grill or Griddle: Heat your grill or griddle over medium heat until it reaches a steady temperature between 350°F and 400°F. While heating, prepare all burger toppings and mix the secret sauce ingredients.
  3. Prepare and Season Burgers: Divide 2 tsp of yellow mustard evenly among the 4 patties, spreading about 1/2 tsp per patty on one side. Plan to grill the mustard side down first to infuse flavor.
  4. Grill Burgers: Place the patties on the grill, mustard side down, and cook for 6-10 minutes per side depending on your desired doneness. When flipping the burgers halfway through cooking, add a slice of cheddar cheese to each patty to melt.
  5. Assemble Lettuce Wraps: Once cooked to your liking, immediately serve the burgers in lettuce leaves. Top each with caramelized onions, sliced tomatoes, dill pickles, and a generous spoonful of the secret sauce. Wrap to enjoy.
  6. Bonus Step - Share Your Experience: If you try this recipe, please leave a rating or comment to help continue delivering quality free recipes.

Notes

  • For authenticity, use naturally colored yellow cheddar cheese; avoid chemically dyed varieties.
  • The nutrition info accounts for a 2-ounce slice of cheese per burger and the secret sauce divided into 4 servings.
  • The secret sauce is slightly sweet; feel free to add maple syrup or coconut aminos to taste for sweetness.
  • Author: Amelia
  • Prep Time: 20 minutes
  • Cook Time: 40 minutes
  • Category: Lunch
  • Method: Grilling
  • Cuisine: American

Find it online: https://recipesvibe.com/in-n-out-style-lettuce-wrap-burgers-with-caramelized-onions-and-secret-sauce-recipe/