Essentially a walnut cake this is part vanilla and part mocha, this is one of the moistest bundt cakes I've ever tried. It's also a beautiful cake and the combination of flavours is just perfect. The recipe is from Dorie Greenspan's wonderful cookbook, "Baking: From My Home to Yours". This dense, buttery cake i a great keeper; wrapped well, it will keep at room temperature for up to five days or in the freezer, for up to 2 months. Serve plain or with a drizzle of hot fudge sauce.