Heat a skillet with part of the margarine or butter.
When the foam subsides, add the potato cubes and cook over moderate heat till golden brown and tender.
Remove to a platter.
Add the remaining margarine or butter to the skillet and cook the onions till soft and translucent.
Mix with the potatoes.
Sauté the ham, add the beef and brown it lightly.
Return the potatoes and onions to the skillet, mix well.
Add salt and pepper to taste, heat the hash thoroughly and transfer to a heated platter.
Sprinkle with chopped parsley.
Fry the eggs in vegetable oil in a separate skillet. Serve the eggs on top of the hash, accompany with ketchup and A1 sauce.