This dish is a variation on the French classic gratin Savoyard and uses mirlitons, a favorite vegetable around New Orleans, which are called chayote elsewhere.
Bring a large saucepan of water to a rolling boil with the lemon, cloves, and peppercorns. Add the rutabaga slices (it helps to do this in a large sieve or a chinoise), boil for about 2 minutes, then remove and drain.