In a small bowl, sift the flour and baking powder together, set aside.
In a small saucepan over medium heat, scald milk, set aside.
Meanwhile, in the bowl of a stand mixer, beat the egg whites with the whisk attachment until stiff, set aside (or use a hand mixer).
In another bowl, whisk the egg yolks with the salt, sugar, melted butter and cardamon. Slowly add the milk, whisking constantly so you don’t scramble the egg yolks.
Slowly add the sifted flour/baking powder to the egg yolk/milk mixture.
Fold in egg whites.
If using raisins, add those now.
Now that the batter is ready, heat the aebleskiver pan over medium heat, adding 1 tablespoon of shortening into each well of the pan.
Drop rounded spoonfuls of batter into each well of the pan and fry until the first side is a dark golden brown. Flip (I use chopsticks to do this, but a fork will also work) and fry until the second side is golden brown.
Remove fritters from the pan and immediately drop into a paper bag or bowl of sugar, toss to coat.