INGREDIENTS
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36-ounce boneless, skinless chicken breasts
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1tablespoonolive oil
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1/2cupmayonnaise
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1/4cupchopped tarragon
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1teaspoongrated lemon zest plus 1 tablespoon fresh lemon juice
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2sliced scallions
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2sliced celery stalks
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kosher salt and black pepper
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1poundwatercress, thick stems removed