I just got a copy of Classic German Baking (!!). Some of the recipes contain a good amount of cinnamon, a favorite flavor of mine. The author doesn't talk about cassia cinnamon vs. true cinnamon/Ceylon cinnamon, so I'm thinking she meant the choice to be baker's-preference. I'm curious, though, whether one type's preferentially used for traditional (or non-traditional) German baked goods - does anyone have a sense of this? I poked around on the internet a bit (including the author's Wednesday Chef blog) but didn't uncover much.