1. Preheat the oven to 200°C / 392°F / gas mark 6
2. Wash and peel all the root vegetables and cut into large chunks.
3. Peel the onion and remove the ‘hairy’ root, cut the onion into quarters through the root so it holds together.
4. Separate and peel the garlic cloves.
5. Mix all in a large oven tray with the olive oil, sat, pepper and herbs if using.
6. Roast in the oven turning 2 or 3 times for about 45 minutes or until soft and turning a golden colour.