Homemade In-N-Out Double Double Recipe - Los Angeles Times

Ingredients

• 1/2 cup mayonnaise
• 3 tablespoon plus 2½ teaspoons ketchup (scant ¼ cup)
• 1 teaspoon yellow mustard
• 2 1/2 teaspoons sweet pickle relish
• 2 1/2 teaspoons dill pickle relish
• 1 teaspoon Worcestershire sauce
• 1 teaspoon white wine vinegar
• 1/2 teaspoon salt
• 1/2 teaspoon sugar
• 2 pounds ground beef chuck (80/20 fat ratio if possible)
• 16 iceberg lettuce leaves
• 8 slices beefsteak tomato
• 1 small yellow onion, thinly sliced into rings
• 16 slices American cheese
• 8 white hamburger buns
• Sauce
• Salt