I started with the ground beef. I know some people mix in pork and/or veal. I've done so in the past too. But I went with straight beef this time. I don't like to use very lean beef in my meatballs. They become too stiff. To the ground beef, I added salt, pepper, and red pepper flakes.
I also added fresh ricotta cheese, parsely, scallions, bread crumbs,and grated pecorino cheese.
Then form them into balls and line on an oil baking sheet. Bake in the oven at 350oF until browned, about 30-60 minutes depending on the size of your meatballs.