Plot: We reveal the keys to two grilled dishes: Stuffed Chicken Breasts with Prosciutto and Fontina, which has a stuffing that stays put inside moist and smoky chicken, and Grilled Tuna Steaks, which have hot exteriors and cool centers. Charcoal-Grilled Stuffed Chicken Breasts with Prosciutto and Fontina Taking a stuffed chicken breast recipe and adding the smoky flavor of the grill sounds like a good idea—if you can get past the leathery exterior and oozing, flammable filling