Delicious Mazurka

Description
In Romanian: Mazurca delicioasa

Ingredients

 * 14 oz/400 g confectioner's sugar,
 * 14 oz/400 g butter,
 * 2 cups blanched,
 * peeled and finely chopped almonds,
 * 1 1/2 cups flour,
 * 12 eggs,
 * vanilla,
 * butter to grease the pan

Directions

 * 1) Cream the butter, add the almonds and mix again.
 * 2) Add flour, then yolks, one by one, vanilla and sugar, little by little; mix very well.
 * 3) At the end, gradually add the whipped egg whites.
 * 4) Fold them in gently.
 * 5) Pour the batter into a baking pan covered with buttered paper and bake at medium heat.
 * 6) When cold, cut into medium sized squares.