Heat oven to 300 degrees. Butter and flour 10" tube pan with removable bottom. Cut out piece of wax paper to fit bottom of tube pan and slide into place.
In medium-size bowl, beat together butter and sugar on medium speed until thoroughly blended, about 5 minutes. Beat in yolks.
In a large bowl, combine sifted flour, salt and baking soda; sift two more times. Alternately beat flour mixture and sour cream with the extracts into butter mixture, beginning and ending with flour.
In large clean bowl, with clean beaters, beat egg whites until stiff but not dry peaks form. Stir one-third of whites into batter. Fold in remaining whites. Spoon into prepared tube pan.
Bake at 300 degrees oven 1 1/2 to 1 3/4 hours or until cake tester inserted in center comes out clean. Transfer pan to wire rack; let cool 5 minutes. With long, thin knife, separate sizes of cake from pan and from tube. Remove cake from pan to wire rack; let cool completely.
Originally Submitted
9/16/2008
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