Sift the flour, salt, and baking soda together in a bowl. Add buttermilk, and egg yolks, stir until you have a batter.
In a separate large (glass or metal)bowl, beat the egg whites until foamy and soft peaks form. Fold egg whites into the prepared batter mixture.
Place your Ebleskiver pan (or puff pancake pan) over a medium heat. Put 1/8 teaspoon of Crisco int each well in the pan. Pour the batter into each well in the pan until 2/3's full. Cook until browned then flip with toothpicks or chop sticks (even 2 forks will do) Cook 1 - 2 mins each side.
If you want to add a filling, only fill the well 1/2 full then add fruit. it will sink into the batter.