Preheat the oven to 375F and line a baking sheet with parchment paper.
In a medium bowl, combine ground turkey, egg, parsley, and breadcrumbs.
Using your hands, form 16 meatballs and place them on the baking sheet.
Bake for 20 minutes, until the meatballs are browned and cooked through. Remove from the oven and set aside next to the stove.
While the meatballs are baking, cook the rice according to the package directions.
Make the sweet and sour sauce directly in a large 5qt pot, big enough to add the meatballs back in. Whisk the pineapple juice, rice vinegar, ketchup, soy sauce, and brown sugar directly into the pot. Bring the sauce to a simmer and reduce the heat to low.
In a small bowl, combine the cornstarch and water. Pour it into the sauce and mix to combine.
Once the sauce is ready, add the cooked meatballs to the pot and stir to coat all of them with sauce.
Serve the meatballs over cooked rice.
Notes
Slow cooker method: Make the meatballs by following steps 1-3. Place the meatballs in the slow cooker on high, and cook for 5-6 hours. In the last 30 minutes, make the sauce in a saucepan and pour over meatballs. Cook for an additional hour.Nutrition Information is calculated without rice or pasta. The number of meatballs will vary depending on the size of your ball. Typically it's 12-16 meatballs per pound of meat, about 3-4 meatballs per person.