Separate yolks from the egg whites and keep aside separately

Sift flour and baking powder

Add salt and mix

In a separate bowl add butter and sugar and mix till creamy

Add egg yolks one at a time beating thoroughly.Add the squeezed orange juice

Add flour mix and orange zest and mix till well absorbed

Beat egg whites till frothy

Add a third of whites to the batter add mix gently

Add 1/2 of the whites and continue mixing

Add the rest of the whites and mix gently till absorbed.

Put the batter in your greased tin and bake.