Cavolo nero is real local and the base of the well known ribollita. Cook 200 grams of chopped cavolo nero(remove the real hard parts) for 10 mins in salted water. Drain carefully and cool down. Put the cavolo nero in the blender with 200 grams of ricotta, 50 grams of grated pecorino or parmigiano, 1 … More Gnocchi nudi o ravioli nudi?