English to Romanian Science Wine / Oenology / Viticulture Botanică

"But before the grapes can be used to make grappa, they are first used to make wine. Once all the juice has been pressed out to make wine, all that's left are these alcohol laced skins, ***stems*** and seeds, the perfect beginning for grappa".
Iată ce am găsit despre stem:

remove stem of: to take off the stem or part of the stem from something, especially a flower, fruit, or vegetable.

stem [stem]
n
1. botany main axis of plant: the main axis of a plant that bears buds and shoots.
It is usually above ground, although some plants have underground stems (rhizomes).
2. botany secondary plant branch: a slender part of a plant other than its main axis that supports a leaf, flower, or fruit

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Nu pot să-mi dau seama ce este. Clar este vorba despre seminţele şi cojile strugurilor, este cumva ***pulpă***?
Nu sunt sigură.

Mulţumesc!