Pound Cake with yolks

1 1/4 cups unsalted butter , plus 1 tablespoon unsalted butter 2 1/2 cups cake flour (or 2 1/3 cups all-purpose flour) 3 tablespoons cake flour 1 1/2[...]

2 cups flour 2 teaspoons baking powder 1 cup sugar 1/2 cup low-fat margarine 1 stick low-fat butter 1 teaspoon vanilla 2/3 cup orange juice 2 1/2 tablespoons[...]