A wonderful and very elegant dinner party dish, and one that will impress your family and friends! These little parcels can be made ahead of time and frozen uncooked. In France you can buy these ready made in most supermarkets and butchers - but these are so easy to make, that I often make my own. You can also use turkey or veal escalopes - the sauce remains the same. Serve these little parcels with seasonal vegetables, gratin potatoes or rice and pasta.