Great way to use ground beef (chuck, sirloin, etc). Very Tasty, and beautiful served over red tomato pasta. The meatballs can be frozen for later use or can also be used in meatball sandwiches topped with your favorite salsa or marinara sauce. This recipe was adapted from a recipe I received about 20 years ago, and I don't remember the source. As a time-saver, I use a food processor to chop the vegetables simultaneously, and also to make the breadcrumbs.