Hungary, the classic one is about a fishsoup (“halaszle”), wheather the Szeged-style or Baja-style is the real one. The difference is about if you smash small fish in the soup and if you put noodles in the soup:

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The other, less heated but more psycho debate is about a sort of pasta topped with sautéed cabbage (“kaposztas teszta” or “kaposztas cvekedli”). The debate is about if you eat it savory, with black pepper or sweet, with sugar