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Heat the oven to 180C/160C fan/gas 4. Make deep cuts into the length of the parsnips at roughly 1/2cm intervals, without cutting through. Put on a baking tray lined with baking parchment in one layer, drizzle with the oil and season. Roast for 20 mins.
Mix the orange juice, vinegar, maple syrup and thyme. Pour over the parsnips and roast for 15 mins more, basting once or twice.