The food from that area where Frankenstein originated (Hesse) and take places has more of a Bavarian flair and heavily uses potatoes in their dishes.
An overview of the culinary delights of the Hesse region of Germany, particularly at their proud history of producing Apfelwein and Bethmännchen!
germanfoods.org
If they go Transylvanian for Dracula lots of soups and similiar style food:
Transylvania is regarded as the most important part of the gastronomic heritage of Romania and reflects its rich and twisted past
www.chefspencil.com