Grate the onion
Grate the Onion finely on the small holes of a box grater until it turns into a wet paste.
Combine the ingredients
In a large bowl, combine the Ground Pork, grated onion, Egg, Milk, Breadcrumbs, Salt, and Pepper. Mix gently with a spoon or your hands until everything is evenly distributed and the mixture looks sticky and cohesive.
Rest the mixture
Cover the bowl and let the mixture rest for 10 minutes so the breadcrumbs absorb the milk and the mixture firms up enough to shape.
Shape the patties
With lightly damp hands, divide the mixture into 8 equal portions and shape each one into a small flattened oval, about 1/2 inch thick. Press them just enough to hold together without packing them hard.
Heat the pan
Set a skillet over medium heat and add the Butter and Vegetable Oil. Heat until the butter foams and the fat looks glossy and ready.
Fry the frikadeller
Lay the patties in the hot fat with space between them, working in batches if needed. Fry for 4 minutes on the first side, until the bottoms are deep golden brown. Flip carefully and fry for 3 minutes more until the second side is browned and the centers are cooked through.
Serve warm
Move the frikadeller to a plate and serve them warm right away.
