It's a Scandinavian potato crepe, made as a treat here in Canada, usually for Christmas or Easter.

Lefse (Mom's recipe)

3 c cooked, riced potatoes (you need a ricer to get the right texture)
4 tbsp oil
1 tsp salt
1 c flour
1 tsp sugar

Mix ingredients well. Take a large tablespoon of dough and roll in hands to a round shape. Roll as thin as you can on a well-floured board. Bake on top of grill, electric frying pan or on top of a wood stove. Bake on both sides until brown spots appear.

In my family, we spread a thin layer of butter on it and a sprinkle of sugar, then roll it up.
Other families might put jam on it, or even meat or cheese.