In a small bowl, combine all of the ingredients together and season with salt and pepper to taste. Preheat two large sauté pans over medium/low to medium heat. Whisk together the mayonnaise, ketchup, mustard, onion, garlic, and vinegar in a bowl. Directions. In-N-Out has their own burger sauce that is unique to the chain. https://www.tasteofhome.com/collection/in-n-out-copycat-recipes Add onions and brown sugar. Heat oil in a heavy skillet. In-N-Out Burger Sauce Recipe. Season with hot sauce and seasoned pepper to taste. Step 1. Rate this Recipe. Cover and chill at least 1 hour before serving. Directions. Instructions Checklist. Combine mayonnaise, ketchup, relish, salt, pepper, sugar and vinegar in a bowl and mix to combine. Refrigerate overnight before using. Start at medium/low and then turn up the heat if needed after 5 minutes of pre-heating. Select rating Give In-N-Out's Special Sauce 1/5 Give In-N-Out's Special Sauce 2/5 Give In-N-Out's Special Sauce 3/5 Give In-N-Out's Special Sauce 4/5 Give In-N-Out's Special Sauce 5/5. https://www.chef-in-training.com/copy-cat-in-n-out-burger-and-sauce https://consumerqueen.com/recipes/copycat-in-n-out-burger-sauce Advertisement. Cook on low until caramelized, stirring occasionally (about 40 minutes on my electric stove) Animal Style Sauce. You will need the following ingredients to make this Copycat In-N-Out Burger Sauce: Ketchup, Mayonnaise, White Vinegar, Sweet Relish, White … The sauce really enhances the burger to make this guy taste authentic. To prepare each burger, separate a hamburger bun and place the face of the top and bottom bun on one of the … You can pretty closely replicate it by combing 2 parts mayo, 1 part ketchup and some sweet relish.