
Preheat the oven to 325 F. Butter a 9 by 5-inch loaf pan. Combine the white flour, whole-wheat flour, wheat germ, salt, and soda in a medium bowl and set aside. In a large, heavy saucepan, melt the butter and stir in the honey until evenly mixed and just lukewarm. Add the eggs and banana, combining thoroughly. Stir in the dry ingredients in two parts, adding the hot water between additions to make a light, smooth dough. Stir in nuts or fruits as desired. Push into the prepared pan, level the surface, and bake 70 minutes, or until humped, brown, and firm to the touch. Cool in the pan on a rack. Turn out, wrap well, and store a day before slicing.