In theory, you’re putting the meat on a surface that can more efficiently move heat away from the point of contact. You’ll see lots of demonstrations with ice cubes – an ice cube on the counter will cool that one small part of the counter down towards freezing. Put the same ice cube it on one of these, and the small area coldness is now spreading out through the entire thing.
It’s worth noting that they really don’t thaw meat that much more quickly than just leaving it out, and that thawing meat on a counter can be dangerous.
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