To make the stuffing: soak the bread in the milk for 10 minutes, then squeeze it dry and crumble it. Melt the butter and fry the onion until soft. Add the chicken liver and heart and sauté for 1-2 minutes until brown but still pink in the center. Cool slightly, then chop the mixture and stir into the breadcrumbs with the ham, garlic, parsley, nutmeg, salt and pepp