Prepare the veal and cut it into 8 thin slices about 4 in. by 3 in. and season. Place a slice of bacon on each piece of meat and spread with a thin layer of forcemeat. Then roll up tightly and fasten securely with fine string. Heat the fat in a saucepan and fry the rolls (olives) until lightly browned. Pour off the surplus fat and add the hot brown sauce to the olives. Cover and simmer gently for about 1½ hr. When tender, remove the string and place the olives on a bed of mashed potato and pour the sauce over. Garnish with green peas and slices of lemon and serve with spinach purée.