Clabber Cake

1 cup (2 sticks) margarine
2 cups granulated sugar
2 eggs
1/4 to 1/2 cup cocoa
3 1/2 cups cake flour
2 teaspoons baking soda (dissolved in a little water)
1 teaspoon vanilla extract

Cream butter and sugar. Add eggs. Sift cocoa and cake flour. Add alternately flour and cocoa with milk, salt, baking soda and vanilla extract. Bake in 13 x 9-inch pan at 350 degrees F for 45 minutes. Ice with chocolate or butterscotch icing.