Cheddar BLT Burgers With Tarragon Russian Dressing

Name: Cheddar BLT Burgers With Tarragon Russian Dressing
Ingredients: 1/2 cup mayonnaise; 1/3 cup ketchup; 1 tablespoon red wine vinegar; 1 tablespoon grated onion; 1 tablespoon chopped parsley; 1 tablespoon chopped tarragon; 1 teaspoon Worcestershire sauce; 12 ounces thickly sliced bacon; 1 1/3 pounds ground beef chuck; 1 1/3 pounds ground beef sirloin; 1 teaspoon kosher salt; 1/2 teaspoon freshly ground pepper; 2 tablespoons unsalted butter, melted; 3 ounces sharp cheddar cheese, cut into 6 slices; 6 hamburger buns, split and toasted; 6 iceberg lettuce leaves; 6 slices of tomato; 6 slices of red onion