Assertion: grape's stem | /r/HasProperty | removed before fermentation
Facets:
value: usually
type: TEMPORAL
value: for red winemaking
type: PURPOSE
Source sentences:
text: For red winemaking, stems of the grapes are usually removed before fermentation since the stems have a relatively high tannin content; in addition to tannin they can also give the wine a vegetal aroma (due to extraction of 3-isobutyl-2-methoxypyrazine which has an aroma reminiscent of green bell peppers.)