For the meatballs: Combine the ground beef, pork, breadcrumbs, Parmesan, ricotta, parsley, crushed red pepper, salt, garlic, eggs, milk and black pepper in a bowl. Mash with your hands until thoroughly combined. Form into small balls and place on a baking sheet. Set in the fridge for 1 hour.
Heat the oil in a large skillet over medium-high heat. Brown the meatballs in batches until nice and deep golden, then move them to a plate.
For the sauce: Into the same skillet, add the garlic and onions and cook for 2 to 3 minutes. Add the tomato sauce, parsley, tomato paste, sugar, salt, crushed red pepper and black pepper. Reduce the heat to medium low and cook for 15 to 20 minutes.
Add the meatballs back to the skillet and simmer another 15 minutes. Keep warm until serving.
Transfer to a chafing dish and serve with frilly toothpicks.