How to Make It
Prepare the Meatballs: Whisk together parmesan, dried minced onion, half-and-half, eggs, egg yolk, garlic, parsley, basil, and oregano in a large bowl until well combined. Add ground round, ground pork, salt, and pepper. Using your hands, mix just until combined. Stir in breadcrumbs just until incorporated. Shape mixture into 18 (2-inch) meatballs.
Set Instant Pot to “Saute,” and add oil. Working in batches of 6 meatballs, add to Instant Pot, and cook, stirring often, until browned on all sides. (Meatballs will not be cooked through.) Remove browned meatballs from Instant Pot, and set aside.
Prepare the Sauce: Heat oil in Instant Pot. Add onion and garlic, and cook, stirring occasionally, until onion is transluscent. Add crushed tomatoes, tomato puree, water, tomato paste, sugar, basil, salt, pepper, and bay leaf; stir until well combined. Add meatballs, and gently stir to coat. Cover with lid, and turn knob to seal position. Press “Manual” and “Adjust,” and set time to 25 minutes.
Carefully turn knob to vent position to release steam. Remove lid. If desired, stir in fresh herbs. Serve over pasta.