I do not know.

I imagine it involves taking bunches of grapes

and [u]crushing[/u] them [i]together[/i].

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Christopher Joel Dandrow

New wine is made by crushing grapes. Wine that is an alcoholic drink is made by putting yeast {leaven} in the grape juice.

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Gary Eckenroth

Good source of brief information - [url=http://en.wikipedia.org/wiki/Winemaking]Winemaking[/url]