Preheat the oven to 180°C.
Peel the vegetables, then cut them into long, thin pieces. Scatter them into a roasting dish, drizzle with olive oil, season with salt and pepper, then bake for 15 minutes, until tender.
Meanwhile, mix the maple syrup, cinnamon/ginger and the grated zest & juice of the orange.
Take the roasting dish out of the oven, scatter the chestnuts around the vegetables then pour the glaze over and combine well. (Using a silicon brush might help).
Bake for 10-15 minutes or so, until caramelized.
Serve warm.