* Peel orange, cut into quarters and thinly slice across the sections, or cut into a pretty pattern of your choice.
1. Cream margarine and sugars until light and fluffy. Blend in vanilla. Beat in eggs one at a time.
2. Stir flour, salt, soda, and baking powder together thoroughly; blend into creamed mixture alternately with half cup sour cream and milk. Begin and end with flour.
3. Pour into greased and waxed paper-lined (grease the waxed paper lightly also) 13 x 9 x 5 cm pan. Bake in preheated 350-degree oven, 25-35 minutes or until done.
4. COOL COMPLETELY before removing from pan.
5. Cut cake in half to form 2 layers 6- half by 23 cm. Spread 0.75 cup sour cream over layer, arrange orange slices on sour cream.
Top with second layer. Garnish each serving with additional sour cream and orange slices.
* The sour cream is an acquired taste. You may prefer to sweeten it with sugar or honey, or with a mix of half sour cream and half sweetened whipped cream.