• 900 g/2 lbs unpeeled potatoes, preferably Golden Wonders or Kerrs
• 300 ml/½ pint/10 fl oz/1¼ cups creamy milk
• 1-2 egg yolks or 1 whole egg and 1 egg yolk
• 30-55 g/1-2 ozs/¼-½ stick butter
Scrub the potatoes well. Put them into a saucepan of cold water, add a good pinch of salt and bring to the boil. When the potatoes are about half cooked, 15 minutes approx. for ‘old potatoes’, strain off two-thirds of the water, replace the lid on the saucepan, put onto a gentle heat and allow the potatoes to steam until they are cooked.
Peel immediately by just pulling off the skins, so you have as little waste as possible; mash while hot. (If you have a large quantity, put the potatoes into the bowl of a food mixer and beat with the spade.)
While the potatoes are being peeled, bring the milk to the boil. Beat the eggs into the hot mashed potatoes, and add enough boiling creamy milk to mix to a soft light consistency suitable for piping; then beat in the butter, the amount depending on how rich you like your potatoes.
Taste and season with salt and freshly-ground pepper.
Note If the potatoes are not peeled and mashed while hot and if the boiling milk is not added immediately, the Duchesse Potato will be lumpy and gluey.
If you only have egg whites they will be fine and will make a delicious light mashed potato also.