They are not marshmallows....

They're are actually some kind of freeze dried strawberries coated with white chocolate which a friend got from Muji in Hong Kong. They taste pretty good if you don't eat too many of them at a time. What one gets from these were a tart interior of the dried strawberry which have somehow gotten a texture like meringue that's mixed with the creamy sweet white chocolate shell. Pity I can't find them here.

   

Edit 19/07/08 I found these at Muji at Paragon.