Preheat out door grill or griddle pan and a sandwich or panini press.
Combine garlic, rosemary, oil, salt, pepper, red pepper and fennel seed. Add chicken and turn to coat.
Grill the halved lemons until slightly charred. Grill chicken until cooked through 7-8 minutes, turning occasionally. Dress the chicken with the juice of one lemon.
Dress the greens, fennel, and onion with juice of other grilled lemon, a touch of salt and pepper.
Build sandwiches of foccacia, cheese, greens, chicken, greens, cheese and foccacia. Press or grill sandwiches with lid down to mark bread and melt cheese. Cut corner to corner and serve.