Ok, lets get into it.  To make great sparkling wine you gotta harvest those grapes early, that way you get low sugar, which means low alcohol and higher acidity (read crispness).  It is going to ferment twice (once makes wine, twice makes bubbles) which also means a double dose of alcohol creation.  A great sparkling sits down in the 12% alcohol range so outside of the right grapes (read climate, soil) the right timing is crucial.

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