I know that "Bier" is a neutral noun in German (das Bier), so the adjective groß becomes großes. But how does this change for two beers? (In plural). Zwei großen Bier? Is this correct?
Additionally, why is it okay to leave the noun in singular form even though we're saying zwei? (E.g. I hear often zwei Bier, bitte).
Any references for learning the grammar at play here would be much appreciated.