Is one allowed to drink the juices which oozed out during eating; grapefruit issues.
putting a כלי (bowl, plate, container, etc.) under a candle to catch the sparks;
Is one allowed to cut a grape or olive on Shabbos?
(Melting ice.) freezing dry foods; freezing ice pops; automatic ice makers; freezing liquids not to lose taste or not to get spoiled;