Set your rice cooker mode to REHEAT. Press START.
Open the lid. Add oil and diced onions. When you hear it sizzle, use a non-scratch spoon to saute the onions for 5mins or until soft. Add garlic. Saute until fragrant. Add tinned tomatoes, breaking apart the tomatoes with your spoon. Add the rest of the ingredients and mix together.
Place your meatballs into the sauce. Close the lid. Select CONGEE/SOUP. Press START. This dish will be ready in 60mins.
Garnish with fresh parsley. Serve with lots of crusty bread.