Created by cookin4two on May 19, 2012
Step 1: Sift together the flour, baking powder and salt.
Step 2: In a large bowl, beat egg yolks until slightly thickened. Gradually add 1 cup sugar and hot water beating until thick and pale yellow, about 5 minutes, if you don't beat for 5 minutes the cake will not rise you must beat for that long! Blend in the orange juice, vanilla and orange zest. Add flour mixture to egg yolk mixture.
Step 3: In another bowl and with clean beaters, beat the egg whites on medium speed until soft peaks form. Gradually beat in 4 tablespoons (1/4 cup) sugar, about 1 tablespoon at a time, on high until stiff glossy peaks form and sugar is dissolved. Fold a fourth of egg whites into the batter, then fold in remaining whites.
Step 4: Spoon batter into an ungreased 10-inch tube pan. Bake on the lowest rack at 350F for 25-30 minutes or until cake springs back when lightly touched.
Step 5: Immediately invert pan; cool completely. Run a knife around sides and center tube of pan. Invert cake onto a serving plate. Serve each slice topped with whipped cream.