Spread and stretch the sliced beef on your working table.
Arrange the filling on the sliced beef: sausage strips, cheese strips, sliced eggs, pork fat and some ground live.
Roll the sliced beef with all the filling inside and secure with a thread or string.
Repeat the procedure for the two remaining beef slices.
In a pot, place the beef rolls and put the water, the remaining ground liver, grated cheese, chopped onions, bay leaves, ground black pepper and salt.
Cover the pot and bring to a boil. Simmer for one hour.
Add the vinegar and continue to simmer of another hour or until beef is tender.
Slice the beef morcon, arrange on a platter and top with the sauce/ gravy poured on top.
Use a spoon or two of flour added to water to thicken the sauce.
Use a pressure cooker for faster cooking.
Optional: Garnish with olives before serving.