Preheat the oven to gas 6, 200°C, fan 180°C. Toss together the oil, onions, carrots and parsnips, and put in a large roasting tin. Roast for 10 minutes. Give the tin a good shake, then add the sausages and cook for 10 minutes more.
Mix together the honey, orange zest and juice, and then drizzle over the veg and sausages. Sprinkle over the rosemary and return the tin to the oven for 15 minutes until the sausages are cooked through. Serve.
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