Fattigmann (klenäter in Swedish and klejner in Danish) are made from a simple cookie dough spiced with cardamom, cut and folded into long diamond shapes and then deep fried. These date back to the Middle Ages and since they’re cooked on a stove, people without ovens could make them.
Whisk the egg yolks and sugar together in a large mixing bowl until pale and fluffy (you can also use an electric mixer for this).
In a separate bowl, whip the cream and add the cognac. Then fold the cream into the egg mixture.
Add the flour and cardamom and mix until you have a smooth dough. Cover the bowl and set in the fridge over night (or four a few hours).
Roll out the dough on a floured surface. If the dough is too sticky to roll, you might need to knead in a generous amount of flour until you can roll it out.
Use a pastry wheel to slice the dough into long strips and then slice each strip into diamonds. Cut a slit in the center of each diamond and pull one end of the diamond through the slit.
Heat the lard or oil in a large pot to 355°F (180°C). If you don't have a cooking thermometer, you can put the end of a wooden spoon or a wooden skewer into the fat - if it bubbles, it's hot enough to cook the fattigmann.
Gently drop each fattigmann into the fat and fry until each side is a light golden brown. Cool on a wire rack covered in paper towels.
Optional: dust the fattigmann with powdered sugar.