Remove the tough centre stems from the cavolo nero leaves. Wash and blanch in boiling salted water for about 3 minutes. It is important not to overcook.
Heat the olive oil in a heavy-bottomed saucepan and gently fry the garlic. When it begins to colour, add the blanched cavolo, and season generously. Cook together to blend the garlic with the cavolo, about 5 minutes. Remove from the hea