Aebleskiver

Step 1
Beat egg whites in a clean glass or metal bowl with an electric mixer on high speed until stiff peaks form. Set aside.

Step 2
Mix together buttermilk, flour, egg yolks, melted butter, sugar, baking powder, baking soda, and salt in a large bowl; beat until smooth. Gently fold in egg whites.

Step 3
Heat an aebleskiver pan over medium heat. Put about 1 tablespoon vegetable oil in the bottom of each cup.

Step 4
Pour about 2 tablespoons batter into each prepared cup. As soon as bubbles appear around the edges, turn them quickly. (Danish cooks use a long knitting needle, but a fork will work.) Continue cooking, turning the ball to keep it from burning.