Is one allowed to drink the juices which oozed out during eating; grapefruit issues.
This Melacha Applies to Items Which Grew from the Ground. Even Blowing with One's Mouth Is Part of the Melacha;
more examples of "מבטל כלי מהיכנו" (nullifying a vessel from its normal usage) that come up on Shabbos;
An Interesting Sheila (Question) Related to the Melacha of Zoraya;