Double-Double Burger PT40M https://img1.recipesrun.com/201907/2019/1028/64/1/703352/300x200x90.jpg When trying to recreate In-N-Out's double-double burger, here's what I learned: Slathering the patty with yellow mustard while it’s cooking is key. It's what makes an "Animal-Style" burger. When seasoning the patties, don't overdo it with the salt—the mustard is already pretty salty. 4 servings Ingredients: 1 tomato, sliced Iceberg lettuce 3 potato buns, toasted 4 tbsp. yellow mustard 6 slices American cheese Freshly ground black pepper Kosher salt 1 lb. ground beef 1 tsp. lemon juice 2 tsp. barbecue sauce 2 tsp. honey mustard 1/4 c. mayonnaise 1 tbsp. apple cider vinegar Freshly ground black pepper Kosher salt 1 large onion, chopped 1 tbsp. butter 1 tbsp. vegetable oil