Boil the potatoes in salted water until soft. Drain and when cool enough to handle, peel and mash them. Chop up the meat finely, mix in the garlic and mash into the potato. Add the parsley, egg, parmesan, a good grating of nutmeg and a grind of pepper. There should be enough salt from the potatoes and bollito, but check just in case.
Shape into patties about 5 cm (2 inches) or so in dia