Boil potatoes in a pot of water for 10 minutes. Drain the potatoes and leave to cool. Or even better take boiled potatoes from the day before. Peel the potatoes and cut them into equal cubes.
Heat the vegetable oil in a large frying pan with a lid. Add the potato cubes and fry with the lid closed so that the cubes are nicely cooked. After 5 minutes, first turn, and then fry for another 5 minutes. Turn the fried potatoes, add the onions and bacon, but do not mix them yet.
After another 5 minutes, then turn with the onions and bacon. Continue frying everything until the potatoes are nice and crispy. Just before the end of the frying time, season with salt, pepper and marjoram. Prepare the gravy according to package directions and heat the meatloaf. Serve everything together.