Step 1

Preheat the oven to 200C/gas 6/fan 180C. Cut the sweet potatoes into wedges and put them in a large roasting tin. Drizzle over 2 tablespoons of the oil and toss the wedges to coat. Roast for 40-45 minutes until cooked through and crisp.

Step 2

Halfway through the cooking time, heat the remaining oil in a frying pan. Add the sausages and cook for 20 minutes, turning regularly until cooked through.

Step 3

Drain off any fat and add the onion marmalade, with about 100ml/31⁄2fl oz water. Stir well then heat through.

Step 4

Sprinkle the chips with a little salt and serve with the sausages and gravy.