Wash the potatoes, boil them, peel them while they are still hot, cut into cubes. Finely chop the onion, roast in the lard until golden yellow, add meat or sausage remains (bacon), roast, add potatoes, salt, pepper, brown well, should also have some sediment (the potato should have disintegrated a bit)
If you want, you can cut hard-boiled eggs with it, it tastes good (a la Papa). If you want, you can also add parsley.