Leftover Turkey Sandwich

Ingredients for 4 servings
½ large white onion, finely chopped, 2 tablespoons white wine vinegar, 2 tablespoons lemon juice, 4 teaspoons dijon mustard, divided, fine sea salt, to taste, black pepper, to taste, ⅓ cup olive oil, 1 tablespoon fresh dill, finely chopped, ¼ cup sour cream, 1 lb leftover turkey, chopped into ½-inch (1 cm) pieces, 8 slices swiss cheese, 1 small head little gem lettuce, leaves separated, cleaned, and dried, 8 slices pullman loaf, or white bread.
Preparation
1. In a medium bowl, stir together the onion, vinegar, lemon juice, and 2 teaspoons of the mustard. Season with salt and pepper and set aside for 10 minutes.
2. Begin to add the olive oil drop by drop, whisking constantly, until the mixture is emulsified. Add the dill and stir to combine.
3. Transfer 3 tablespoons of the vinaigrette to another medium bowl and whisk the sour cream into the remaining vinaigrette. Add the chopped turkey and mix to combine.
4. Gently toss the lettuce leaves in the reserved dressing.
5. Spread four slices of the bread with ½ teaspoon mustard each.
6. Divide the turkey between all four slices and top with the sliced cheese, dressed lettuce leaves, and the remaining bread slices.
7. Enjoy!

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