Whip the butter with the sugar until it reaches a creamy consistency. Add 3 egg yolks, one at a time, then sift in the flour, baking soda, potato starch and a pinch of salt. Beat the egg whites till stiff then add to the batter. Mix well and place in a 10-in. cake pan lined with buttered parchment paper, leveling the top. Bake at 350ºF for about 30 mins.
Note:
If wrapped in aluminum foil, this cake keeps several days. It is best if eaten the day after baking. |
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