Peel, wash and slice the potatoes into thick slices. Cut the bacon into strips but keep the fat on as it adds all the flavour. Thinly slice the onions.
Take a large pot and place a layer of potatoes until the bottom is covered. Add a layer of bacon over the potatoes, then a layer of onion slices. Sprinkle a generous amount of salt and a little pepper over the onions. then continue to layer potatoes, bacon and onion, salt and pepper until the ingredients are used. Do not fill the pot all the way to the top but leave some space to prevent it from bubbling over.
Fill the pot with cold water until everything is just covered and put on a medium heat until the potatoes are soft, about 25 minutes. Allow to sit for 5 minutes and ladle into bowls. The broth can be accompanied by crusty rolls, crusty bread or even normal bread and butter.
You can also make the broth in the slow cooker following the same process. Cook on high for 30 minutes, then for about 1 hour on medium low. This can also be made on a low setting overnight.