First, put the ground beef, breadcrumbs and grated parmesan in a large bowl. Chop the parsley and garlic very finely and add them as well.
Then add the egg and season with salt and pepper. Now mix everything thoroughly with your hands until you get a compact mass.
Cover with plastic wrap and let rest in the refrigerator for at least half an hour.
After resting, use your hands to form small meatballs from the mixture.
Heat plenty of sunflower oil in a high pan to about 340°F/170°C. Then put the meatballs into the boiling oil. Fry each for about 3-4 minutes until they are golden brown. Remove the finished meatballs, drain on a paper towel and set aside.
Peel and finely chop the onion. Heat the olive oil in another large frying pan and sauté the onion until it becomes translucent.
Then deglaze with the strained tomatoes, add a little salt and bring to the boil briefly. Then reduce the heat, add the fried meatballs and simmer gently for 10 minutes.
Finally, transfer in portions to deep plates, serve immediately and enjoy hot.