[Avodah] Making Ice Cream on Shabbat

[Moshe Y. Gluck]

R' MB: 
Those shitos that permit ice should have no problem here either, I would
think. (Machloqes is discussed in 10:4 and fn 14.)
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My LOR told me that he heard from R' MF that back in der heim (not his
words) they would make ice all the time - they would put cups of water on
the windowsill on Friday night, and take it back in after it was frozen
Shabbos morning.

KT,
MYG