Sauté the onion and garlic in olive oil until translucent. Set aside to cool. Combine the pork, beef, breadcrumbs, cheese, eggs, water (or broth), parsley, salt, pepper, and the onion and garlic mixture in a large bowl. Mix well. Roll into balls. On a cookie sheet slightly greased or lined with parchment paper, bake meatballs at 375°F for about 15 minutes, or until the meatballs are browned (or cook meatballs on medium-high in a frying pan with a little oil until browned).