Instructions: Boil the potatoes in their jackets until just tender. Cool and store in the fridge to firm up for at least one day, prefer- ably two. When ready to use, grate potato coarsely, finely chop the onion, mix together and season to taste. (Ruth says you can also add chopped bacon, to make speck rosti, though this is usually a breakfast dish.)

Heat the margarine in a frying pan and add potato mixture. Do not press it down; keep it loose and light. Cook it for 10-15 minutes on medium heat, turning it in sections a couple of times. Towards the end, leave it to form a golden brown crust on the bottom. Turnout, crust upwards, onto a platter and serve.

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