Turkey, Cheddar, and Pickled Apple Sandwiches | America's Test Kitchen

Ingredients

• 1 cup cider vinegar
• 5 tablespoons honey , divided
• 3/4 teaspoon table salt , divided
• 1 apple , cored, halved, and sliced thin
• 1/2 cup mayonnaise , divided
• 1/4 cup whole-grain mustard
• 2 teaspoons minced fresh rosemary
• 8 slices hearty multigrain sandwich bread
• 8 slices cheddar cheese (8 ounces), divided
• 1 pound thinly sliced smoked turkey