Make the Meatballs:

• In a large bowl, combine the ground beef, breadcrumbs, Parmesan cheese, egg, minced garlic, oregano, salt, pepper, and parsley.

• Mix until everything is well combined.

• Shape the mixture into small meatballs, about 1 inch in diameter. You should get around 20-24 meatballs, depending on size.

Cook the Meatballs:

• Heat the olive oil in a large skillet over medium heat.

• Add the meatballs and cook, turning occasionally, for 8-10 minutes, until browned and cooked through. You can also bake the meatballs at 375°F (190°C) for 15-20 minutes if you prefer an oven-baked method.

Make the Sweet and Sour Sauce:

• In a medium saucepan, combine the ketchup, apple cider vinegar, brown sugar, soy sauce, Worcestershire sauce, Dijon mustard (if using), garlic powder, and ground ginger.

• Bring the mixture to a simmer over medium heat, stirring occasionally, until the sugar has dissolved and the sauce has thickened slightly (about 5-7 minutes).

• If you prefer a thinner sauce, add a little more water to reach your desired consistency.

Coat the Meatballs:

• Once the meatballs are cooked, remove them from the skillet (or oven) and transfer them to a serving dish.

• Pour the sweet and sour sauce over the meatballs and toss gently to coat them evenly.

Serve:

• Serve the Sweet and Sour Meatballs immediately, either as an appetizer or over a bed of rice for a complete meal. You can garnish with extra chopped parsley or green onions if desired.