Preheat the oven to 300F / 150°C In a large flameproof heavy pot with a tight lid, start layering the ingredients: onions, bacon, sausages or sausage pieces, potatoes. Season each layer liberally with fresh-ground pepper and the chopped fresh parsley. Continue until the ingredients are used up. Pour the bouillon mixture over the top. On the stove, bring the liquid to a boil. Immediately turn the heat down and cover the pot. (You may like to additionally put a layer of foil underneath the pot lid to help seal it.).