Secret Ingredient Leftover Turkey Salad

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4 cups chopped leftover turkey

1/2 cup mayonnaise (see Cook's Note) 

2 teaspoons Dijon mustard 

1 tablespoon fresh lemon juice 

2 teaspoons sugar 

1/2 cup finely diced celery 

1/4 cup sliced scallions 

2 teaspoons chopped fresh dill 

Kosher salt and freshly ground black pepper 

Bread or rolls, lettuce leaves and sliced tomatoes, for serving, optional