"Prepare this deconstructed sandwich at night or in the morning, and store each part separately. At lunchtime, or dinnertime, simply arrange and serve...."
INGREDIENTS
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6 slices bacon
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4 boneless, skinless chicken breast halves, (6 to 8 ounces each)
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coarse salt and ground pepper
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3 plum tomatoes, quartered lengthwise, seeded, and cut into 1/2-inch pieces
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1/2 small red onion, finely chopped
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2 celery stalks, sliced crosswise 1/4 inch thick, plus 1/2 cup celery leaves (optional)
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1/2 cup light mayonnaise
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1 tablespoon white-wine vinegar
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lettuce leaves, for serving