1. Butterfly each chicken breast by halving it horizontally.
2. Leave one side attached, so that it opens into a large thin cutlet.
3. Whisk together the mustard, oil, lemon vinegar and thyme.
4. On a plate coat the chicken with the marinade, stacking the breasts as they are coated.
5. Cover the chicken and let it marinate in the refrigerator for 30 minutes to 3 hours.
6. Discard the marinade and grill the opened chicken breasts over hot coals for 5 minutes.
7. Turn and top each with a slice of ham and Swiss.
8. Cook another 5 minutes. |