Peel and finely chop the onion.
Knead minced meat, breadcrumbs, eggs, onion, mustard, salt and pepper into a smooth mass.
Form the meat mixture into six even balls and flatten.
Heat the oil in a non-stick frying pan and fry the meatballs in it on both sides.
Arrange on a platter with halved cocktail tomatoes and parsley.
Preparation Tip:
The loaves also taste great when enjoyed cold. Ideal to take them to the office the next day.