A while ago, someone requested the recipe for this. This recipe comes from the "King Arthur Flour 200th Anniversary Cookbook".
Friendship Starter: Blend well in a glass or ceramic bowl. Cover with plastic and let it work for at least 24 hours.
Friendship Cake: Preheat oven to 350 F. Beat the oil, sugar, eggs and vanilla until light. Add the starter and beat until smooth. Blend the dry ingredients together and then fold into the wet mixture. Pour into a greased Bundt pan and bake for 40-45 min.