‘CAN I HAVE YOUR RECIPE?’ friends ask each other, back and forth after delicious meals served with love and hopefully a side order of tasty conversation. But so often it’s not “my” recipe, or “yours” that’s on the table, but one that we have found in a cookbook that became identified with us by those we served it to—friends and family who ask us to make “our” dish again. The actual provenance, though, remains the same: “My” sweet potato-greens...