Peel the onions and cut them in half. Then thinly slice them.
Heat a frying pan and fry the bacon until it is crisp and golden.
Remove the fried bacon from the pan and place it on a plate. Set aside.
Fry the onions in the bacon fat until they are golden and soft. Add a bit of butter if there's not enough bacon fat.
Mashed Potatoes
Peel the potatoes and cut them into smaller pieces.
Put them in a pot and cover with water. Do not add salt to the water!
Boil the potatoes until they are completely tender. This takes about 20 minutes.
Drain the water from the potatoes and add butter in small pieces.
Mash the potatoes with your preferred tool - for example, an electric mixer - and add milk until the mash reaches the desired consistency. However, I use a whisk to mash them?
Season the mash with salt, pepper, and optionally grated nutmeg.
Serving
Serve the mashed potatoes with the bacon/onion mixture and garnish with chopped parsley.