Icelandic kleina are deep-fried pasty treats (or donuts), found throughout Iceland. While every Scandinavian country has their version, Iceland's are served year-round, making them an important part of Icelandic cuisine.
Mix all dry ingredients together, including the flour, sugar, baking powder, baking soda, cardamom, and nutmeg.
Add butter and blend until the mixture looks like coarse crumbs.
Beat the remaining wet ingredients together until combined, and then add the wet ingredients to dry. Blend together until fully incorporated into a sticky dough.
Place the dough on a well-floured surface, sprinkle flour over the top and roll out to about 1/4 inch thick (they puff a lot during cooking).
Slice the dough into 2'' wide strips. Then slice each strip diagonally every 4 inches to make diamonds. Slice a slit in the middle of each diamond.
Prepare the kleina by tucking one tip of the diamond through the center slit and pulling through to create a curl in the dough.
Deep fry kleinur in hot oil for about 1-2 minutes each side. Watch them closely, they cook very fast.
When golden brown on both sides, remove the fried pastries to a paper-lined tray to drain.
Serve kleina warm, either plain or dusted with powdered sugar or cinnamon sugar.