It can normally be difficult to cook these porcupine meatballs to perfection because rice is mixed in with the meat, but the pressure cooker solves that. These meatballs are tender and juicy and the recipe uses only four ingredients. You can make this recipe more complex if you'd like. Add some minced garlic, or add herbs such as dried marjoram or dried oregano. The meatballs and sauce are delicious served over more hot cooked rice. Or serve them over hot cooked pasta or mashed potatoes for a comforting, homey dinner. Add a green salad and some brownies for dessert and dinner is done.