Why are grapes not kosher?

Why are grapes not kosher? from the pomace or the marc of the grapes, which includes the seeds, skins and the stems. Most of these byproducts are not produced at kosher wineries, which raises the question of whether we can use them for kosher food production.

from the pomace or the marc of the grapes, which includes the seeds, skins and the stems. Most of these byproducts are not produced at kosher wineries, which raises the question of whether we can use them for kosher food production.
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