Veal. An interesting topic. Badly handled by Aussie supermarkets, consistently cut with the grain, not across it. Italians understand veal, so if you're lucky to live near an Italian butcher (which I'm not) you might be ok. I've had beautiful veal, as pale as pork, in Italy. I think we're squeamish about milk fed veal here, so what we get in Australia is about a year old and red, not white. I think the best choice for involtini in this circumstance is actually pork. The butterfly pork loin fillets, divided in half, are perfect. Flatten them out with your hand, a mallet isn't necessary. Veal cut with the grain, consisting of 2 or 3 muscle groups, is hopeless. If I do use veal, I get a veal loin and cut it into scallopini myself. And I think steaming is a no-no, it has to be fried.