In a large bowl, combine the ground beef, ground pork, chopped onion, minced garlic, egg, soaked bread, parsley, mustard, salt, and pepper.
Mix everything together until well combined.
Form the mixture into oval-shaped patties about 1 inch thick.
Heat the oil in a large skillet over medium heat.
Fry the patties for 5–6 minutes per side until golden brown and cooked through.
Serve warm with mustard, pickles, or your favorite sides.