Meatballs with white wine mushroom sauce

Name: Meatballs with white wine mushroom sauce
Prep time: 15 min
Total time: 15 min
Yield: 4 porties
Cuisine: Belgian
Ingredients: day-old bread; brown onion; fresh flat-leaf parsley; dried mixed herbs; olive oil; beef rump steak; egg; full cream milk; sea salt; ground black pepper