Sift together cake flour, baking powder and salt. Set aside.

With electric mixer, beat egg yolks until slightly thickened; add hot water gradually, beating until mixture is very thick and light (about 10 minutes).

Add flavoring to egg yolks, then add sugar gradually, beating constantly.

Fold in flour, about a fourth at a time (I do this by hand) folding until well blended.

Pour batter into an ungreased 10-inch tube pan.

Bake at 375°F for 40-50 minutes until done.

Remove cake from oven and invert pan.

Let cake stand for an hour until cool.