Cavolo nero is an Italian cabbage whose leaves have a strong irony flavour, beautifully matched in this dish by the earthy mushroom and rich pigeon. If you are unable to source this, however, a hearty kale will suffice. Theo Randall's spatchcock pigeon recipe has strong Italian undertones and is all the better for it.
Spatchcock pigeon on bruschetta with cavolo nero, pancetta and cep mushrooms