Chocolate Sourdough Cake

This is our number one requested Birthday Cake!  We often feel pie is a perfectly acceptable birthday cake as well.  This is another plan-ahead cake, 24 hours at least.  The dough needs to soak, and after the cake bakes, I put it in the freezer.  Most cakes are easier to frost cold, but this one HAS to so the frosting won't melt!  And must be kept in the fridge until ready to be served.  And this just doesn't seem to turn out well beyond May, as sourdough loves cold weather.