As a practical matter, the differences between what one would consider Bohemian cooking, Czech cooking (Bohemia being the most populous province of the Czech republic), Bavarian cooking, most other German cooking as found in this region of the states at least, Austrian cooking, and even most Hungarian cooking as found around here, are at the peirphery. For instance, the food at the Bavarian Lodge in Lisle, Bohemian Garden in Downers Grove, and Epicurean Hungarian in Hillside all are a lot more alike than different.
That is not to say the menus and food are the same. But all serve roast pork, goulash, and roast duck with sides of cabbage, dumplings, etc. Spatzle will show up in German and Austrian places, not so much in Bohemian/Czech and Hungarian places. The Hungarian goulash, and Hungarian food in general, will have more aggressive seasoning. Sausages will figure more prominently on the German menus, etc.
If you pay close attention, you will find the versions of the same dishes from each region will have definite differences, but the cuisine of Mittel Europe does clearly reflect the political, cultural and social melting pot it has been for all of recorded history.
Sorry no one was able to help with the carry out. Christmas Eve on a Monday is a particular challenge. What did you end up doing?
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Feeling (south) loopy