These sweet and sour chicken meatballs are a crowd-pleasing appetizer or main dish that can be easily made in the Thermomix. The meatballs are made with ground chicken, breadcrumbs, egg, and a blend of spices, then baked until golden and cooked through. They are then coated in a tangy sweet and sour sauce made with pineapple juice, vinegar, ketchup, and sugar. Serve these meatballs as an appetizer with toothpicks or as a main dish with rice or noodles.