Beat the yolks until thick and light; add sugar gradually and continue beating; then add water and vinegar; add the salt to the whites and beat until very stiff; sift the flour with baking powder three times; add the flavoring and fold in the flour and the beaten whites alternately as gently as possible. Bake about 30 minutes in slow oven until well risen; then increase the heat. Invert to cool, then remove from pan.
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