We dreamed up a turkey and watercress sandwich that makes the most of holiday leftovers but works just as well with sliced deli meat. Between two slices of white sandwich bread, youll layer a bit of butter, thinly sliced roasted turkey, apple slices, a handful of watercress (which gives the sandwich a pleasant peppery kick). Add mayo if youd like, or even your favorite sliced cheese. Whether you make it as directed or dress it up a bit, this barebones turkey sandwich is simply and nutritiousbut plenty interesting, so you wont get bored with leftover turkey sandwiches a few days post-thanksgiving.