In a large bowl, whisk together cake
flour, cardamom, cinnamon, ginger, salt,
baking powder and baking soda. In a
second large bowl, beat egg whites
until frothy. Add 1/4 cup of the sugar
and beat until stiff, shiny peaks form.
Set aside. In a medium bowl, beat
egg yolks. Split vanilla bean in half
lengthwise and scrape seeds from pod.
Add to egg yolks along with 1/2 cup of
the sugar. Beat until pale yellow and
fluffy, about 2 minutes. On low speed,
beat in milk, olive oil and remaining
1/2 cup sugar. Whisk egg yolk mixture
into flour mixture.