If I were a native speaker, I wouldn't have mead the error that strzyga pointed out.
Many Poles make this error too, treating the makes as proper names. Well they're not.
A Polish friend in Poland said that while ordering food genitive is also used, although I don't know if I believe that. She gave me, however, the example of "Zamow mi shake'a". Maybe it's just genitive for fast food restaurants. :)
Ordering or eating, it doesn't matter, it's just that some foods take the genitive and some don't. Zamów mi shake'a, hamburgera, loda, kebaba, drinka, kurczaka, but: zamów mi sok, napój, barszczyk. Anyway, uncountable nouns don't take Genitive.