These are interesting to me because the UK field mug was despised because it did so badly with boiling water. Either the mug burned your lips or the tea was lukewarm. (Given their size and origin, I suspect that the British versions were originally imagined as beer mugs and impromptu soup bowls, but were pressed into service for tea.)
However, when used with jasmine tea in China, suddenly there were everywhere.
Now, of course, they seem to be nowhere -- are these still popular? Maybe I've got the name mixed up.
