Rösti (pronounced as rusty with a French R) is an original Swiss food, more exactly from the German speaking part of Switzerland, and originally meant as a breakfast meal.
To make Rösti you need 250 grams of potato per person. Peel the potatos and grate them into small parts. Dry the bunch with a kitchen towel, put everything in a bowl. Cut an onion into small parts and add this to the potatos. Add an egg and a bit of flower and mix it until it becomes dough-like.
Heat up a pan with a bit of corn oil and put the dough into it. Let it heat up for a few minutes, from time to time you'll have to check if a crust has formed on the bottom. Slide it over into a dish to flip it over and put it back in the pan to heat up the other side.
After a while you'll have some sort of cake. It's delicious!