Cream butter and sugar until fluffy.
Add eggs, salt, and cardamom and continue to beat.
Add flour alternately with milk, and mix until a soft dough is formed.
Gather dough into 2 or 3 balls of dough.
Place dough on a well-floured surface and roll out with floured rolling pin to approximately ¼ " thickness.
Cut dough into strips about 1 ½" wide.
Make a second diagonal cut forming strips about 1 ½ " wide to form a diamond shape.
Cut a slit in the center and pull one end through the slit to form a knot.
Heat oil to 375 degrees and fry a few at a time, flipping over when the kleinur rises to the top and the bottom side is brown.
Brown the other side. These cook quickly.
Remove from the oil with a slotted spoon and drain on paper towels.
If desired, dust with powdered sugar or cinnamon sugar while hot.
Store at room temperature in an air-tight container.
