Start by taking a large mixing bowl.
In this bowl, combine beef, half of the chopped onions, breadcrumbs, milk, and the egg.
Season your mixture with salt and pepper, ensuring it's mixed well.
Now, shape your mixture into 4 even-sized patties.
Take a skillet or frying pan and melt the butter over medium heat.
Once the butter is shimmering, add your Swedish Beef Patties Onions to the skillet.
Fry each side for about 5 minutes, or until they turn a beautiful golden brown.
Remove the patties and set them aside.
In the same skillet, add the remaining onions and let them sauté until translucent.
Pour water into the skillet, stirring to create a rich onion sauce.
Place the patties back into the skillet, covering them with the onion sauce.
Allow everything to simmer together for another 10 minutes.