Cook the meatballs according to the packet’s instructions.
Preheat the oven to 180°C.
Cut the sweet potatoes, onion, beets in half or into large chunks and put them in a baking tray, together with the garlic (leave their skin on). Brush/spray them with oil, then bake in the oven for about 30 minutes until tender.
When the vegetables are ready, take the dish out of the oven and let them cool.
Remove and discard the skin of the vegetables, put their flesh and any cooking jus into a saucepan. Add the spices and pastes and stir for a minute over low heat. Add the stock and bring to the boil. Turn off the heat and add the parsley. Using a handheld mixer, blend until you get a thick sauce. Taste and adjust the seasoning.
Add the meatballs and gently heat through.
Serve warm.