Peel and cut the swede into 2.5cm (1in) chunks and place in a saucepan with the chopped onion. Cover with cold water and bring to the boil
Reduce the heat and simmer for 15-20 minutres or until the swede is very tender.
Drain, reserving the water if desired (see notes below).
Add 50g (2oz) butter. Season with salt and plenty of freshly ground black pepper. Then mash well.
Serve with a knob of butter on top if desired.
Notes
Cook's TipRather than discarding the water the swede is cooked in, Cook without salting the water then use the water to make stock for gravy. Just add a stock cube to the reserved water. The onion flavoured water gives the stock extra flavour.LeftoversCan be stored covered in the fridge for a couple of days. Reheat in a microwave.Nutrition information is calculated usingan online nutrition database - Based on serving 4 people . It is approximate and is meant as a guideline only. (It does not include seasoning.)