Bran new. . .You mentioned buttermilk, we have always used skim milk along with strictly egg whites. We always incorporate the ingredients at a slow speed using a paddle -- never too long though.
The other ingredients include: bran, all-purpose flour, baking soda, salt, nutmeg, cinnamon molasses, honey, brown sugar, pineapple, carrots, and golden raisins. If you are interested in the exact recipe I will get it for you.