Beat egg yolks and salt until thick and light in color. Add in cream, sugar and butter. Mix well.
Add flour and cardamom to egg mixture. Mix well. Chill one hour.
Roll out 1/4 of the dough at a time, keeping the rest of the dough in the refrigerator. Roll a 1/16 inch thick rectangle. Using a fattigman cutter or a pastry cutter cut in 1 1/2-inch wide strips then cut diagonally at 4-inch intervals (making diamonds). Cut a 1 inch slit lengthwise in center of each piece. Slip one end of the diamond through the cut and pull through gently.
Fry a few at a time in hot oil (350*) for 1 to 2 minutes or until golden brown. Remove to paper towels with a slotted spoon. Sprinkle with powdered sugar.