1/2 cup unsalted butter or margarine
2 1/2 cups granulated sugar
4 large eggs
1 cup plain yogurt
2 teaspoons vanilla extract
1 teaspoon grated orange zest
1/2 teaspoon grated lemon zest
3 cups all-purpose flour
1/4 teaspoon baking soda
1/2 cup unsalted butter or margarine
2 1/2 cups granulated sugar
4 large eggs
1 cup plain yogurt
2 teaspoons vanilla extract
1 teaspoon grated orange zest
1/2 teaspoon grated lemon zest
3 cups all-purpose flour
1/4 teaspoon baking soda
Beat the butter or margarine until creamy
Add the granulated sugar and beat until light and fluffy
Add the eggs one at a time, beating well after each addition
Mix together the yogurt, vanilla extract, and grated orange and lemon zest
Sift the flour with the baking soda and add it to the butter mixture, alternating with the yogurt mixture, starting and ending with the butter mixture
Pour into a greased 23 cm diameter cake pan with a hole in the center and bake at moderate heat (170°C) for about 1 hour
Let cool for 5 minutes before turning out.
