1 1/2 cups sifted flour 
1/8 teaspoon baking soda 
pinch of salt 
1 stick butter or margarine, softened 
1-1/2 cups sugar 
3 eggs 
1/2 cup sour cream 
2  teaspoons lemon juice 
1/2 teaspoon grated lemon rind 

Heat oven to 350 degrees. Resift flour twice with soda and salt. Cream butter and add sugar slowly. 

Add in eggs one at a time. Stir in sour cream. Add flour mixture 1/2 cup at a time. Stir in lemon juice and rind. Bake in well-greased 8-inch square pan for 40-50 minutes or until done. 

[For larger cake, double all ingredients and bake in a 10-inch tube pan for about 1 1/2 hours.]