SLOW COOKER SAUCE:

1. Place the olive oil, onion, garlic, tomatoes, water, salt, and pepper in the bowl of a slow cooker and whisk together until combined. Turn heat on to high.
2. Make the meatballs. Place the ground beef, ground pork, egg, breadcrumbs, Parmesan, salt, and Italian Seasoning in a large mixing bowl and mix together using your hands or a mixing spoon until the mixture is well combined.
3. Use a ¼ cup measure to press the meat mixture into. Tap the measure on your work surface to remove meat. Use your hands to roll the ¼ cup of meat into a large ball. Repeat with the remaining mixture until all of it is formed into balls. Place the meatballs carefully in the crockpot, covering with sauce.
4. Cook on high for 3-4 hours, or until meatballs are fully cooked through and sauce is bubbling. Sprinkle meatballs with parsley before serving.

STOVE TOP MEATBALLS:

1. Place the olive oil in a large stockpot and turn the heat on to medium-high. Add the onion and sauté for 5 minutes, or until translucent. Add the garlic and sauté for another 30 seconds. Add the crushed tomatoes and water, stirring to combine. Bring to a simmer and reduce heat to medium.
2. Make the meatballs. Place the ground beef, ground pork, eggs, breadcrumbs, parmesan, salt, and oregano in a large mixing bowl and mix together using your hands or a mixing spoon until the mixture is well combined.
3. Use a ¼ cup measure to press the meat mixture into. Tap the measure on your work surface to remove meat. Use your hands to roll the ¼ cup of meat into a large ball. Repeat with remaining mixture until all of it is formed into balls. Place the meatballs carefully in the tomato sauce, making sure that the meatballs are fully submerged in sauce.
4. Cover and let simmer for 30-40 minutes on medium heat, until meatballs are fully cooked through.
5. Sprinkle sauce with fresh parsley before serving.