Cook the carrots, swede or turnip and potatoes in a large saucepan of gently boiling water for about 20 minutes, until tender.

Meanwhile, preheat the grill. Arrange the sausages on the grill rack and start to cook them when the vegetables have been cooking for 10 minutes. Grill them for 10-12 minutes, turning often.

At the same time, start to make the red onion gravy. Heat the vegetable oil oil in a large non-stick frying pan and add the onion, cooking until soft and lightly browned – about 3-4 minutes.

Pour in the stock and water, add the herbs, then simmer for 4-5 minutes. Add the blended cornflour and stir until thickened. Keep hot over a low heat.

Drain and mash the vegetables, seasoning with black pepper. Serve 2 sausages per person with the red onion gravy.