Break the bread up into small pieces, place them in a small bowl and pour water/milk over them and let them soak for 15 minutes while you're preparing the other ingredients. Squeeze out any excess liquid.
Heat some oil or butter in a frying and saute the onions until soft and translucent, 5-7 minutes. Add the garlic and cook for another minute.
Place all of the ingredients (except for the olive oil and butter) in a large bowl along with the onion mixture and the soaked bread. Use your hands to thoroughly knead the mixture until well blended and the meat is smooth. The more you knead it, the better the results. Form the meat mixture into balls according to desired size and slightly flatten them. Cover and chill the patties in the fridge for at least 30 minutes.
Heat the olive oil and butter in a frying pan. Once hot add the Frikadellen / Frikadeller and fry on both sides on higher heat until nicely browned, then lower the heat and continue to fry over medium heat until cooked through according to desired doneness. Traditionally served with potato salad or a crusty bread roll slathered with mustard. See blog post for other serving ideas.
Advance Preparation: You can make the meat mixture at least one full day in advance. In fact we recommend it because the flavor only gets better. Cover and refrigerate the meat mixture and then make and fry the patties when you're ready to use them. Or you can also form the patties in advance and keep them covered and chilled until ready to use. Freezing the Frikadellen: They freeze really and will keep for up to 3 months in the freezer. Wrap and store in ziplock freezer bags or airtight containers. Simply thaw and reheat in the microwave, pan or oven.