INGREDIENTS
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2 boneless, skinless chicken breasts (about 1 pound total)
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1 small yellow onion, halved and peeled
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Coarse salt and ground pepper
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1/4 cup chopped toasted walnuts
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2 tablespoons golden raisins
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1 celery stalk, finely chopped
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1/2 small red onion, finely chopped
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3 tablespoons mayonnaise
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1/4 cup nonfat plain Greek yogurt
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2 teaspoons chopped fresh tarragon leaves
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Bread and lettuce leaves, for serving