Finely chop half of the onion and two garlic cloves for the meatballs. Chop the remaining half of the onion and two garlic cloves for the sauce. Roughly chop the fresh parsley and basil.
In a large bowl, combine the ground beef, finely chopped onion (for meatballs), minced garlic (for meatballs), breadcrumbs, egg, chopped parsley, 3g of salt, and 2g of black pepper. Mix thoroughly until all ingredients are well incorporated.
Roll the mixture into small, bite-sized meatballs, about 3-4 cm in diameter. You should get approximately 20-25 meatballs.