This Tuscan technique is guaranteed to turn ho-hum chicken into a juicy, crisp-skinned, flavorful delight. Called pollo al mattone in Italian, the dish starts with a flattened chicken and a savory marinade. Add a foil-covered brick to hold the chicken flat to the grill while it cooks. The result is the crispest possible exterior and a juicy, evenly cooked interior. Switch up the marinade -- recipes for four delicious versions are offered here -- for extra variety.