Dice and freeze fatback. Dice the veal and pork. Heat oil in skillet and saute the onions. Combine meat, onion, and seasonings in a bowl. Combine the cream and egg whites and pour over the meat. Refrigerate for a few hours. Marinate artichokes in wine and brandy. Season with salt and pepper.
Grind the meat with the fatback. Blend in a food processor until smooth. Fold in pistachios and ham.
Grease a 5-cup mold and line side and bottom with pastry dough. Alternate forcemeat and artichokes, ending with forcemeat.
Cover pâté with dough. Brush with egg yolk and cut an opening in the center. Bake at 350°F for about an hour. When cold, fill the pate with sherry wine aspic.