Tear the bread into small pieces and put it in a small bowl. Add 1/2 cup water and soak for 5 minutes.
Put the sirloin, veal and pork in a large bowl. Squeeze the excess water from the bread and add the bread pieces to the bowl with the meats. Add the garlic, eggs, parsley, Pecorino Romano, breadcrumbs, salt and pepper to the bowl, and knead the ingredients together. Form the mixture into about 15 meatballs, about 2 inches in diameter.
Heat a wide, deep, heavy saut pan over medium-high heat. Add the meatballs in batches without crowding and shallow fry them, turning them with a slotted spoon as they cook until golden-brown all over, 6-8 minutes total cooking time.