2 3/4 c. flour
1 tsp. baking soda
1/4 tsp. salt
6 eggs, separated
2 c. sugar
1 c. butter
2 tsp. grated lemon peel
2 tsp. lemon juice
1 c. plain yogurt

Stir flour, soda and salt in bowl. Beat whites until peaks form. Gradually add 1/2 cup sugar, beat until stiff and glossy peaks form. Set aside. Beat butter and remaining 1 1/2 cups sugar, add yolks, lemon peel and juice, beat until fluffy. Stir flour mixture alternately with yogurt into creamed butter mixture. Gently fold into egg white mixture. Pour into greased and floured tube pan (10 inch). Bake at 350 degrees for 50 to 60 minutes.