Boil water in a pot to cook spaghetti, adding a pinch of salt.

Season the ground beef mix with salt and black pepper in a bowl and shape it into small balls by hand.

Heat olive oil in a frying pan and cook the meatballs, turning them to brown evenly.

Remove the meatballs, add more olive oil to the same pan, and sauté the onions and garlic.

Add the canned diced tomatoes, bring to a simmer, and return the meatballs to the sauce.