I think someone else posted on these recently...
I have had them before, but I had one for lunch today.
Possible nominee for my current fav pastry in Boston.
My attempt at a Limsteresque description:
A delicate dusting of powdered sugar; ethereal, flakey choux pastry crumbles perfectly in my mouth. The synergistic melding of the ever so slight earthy note of adzuki paste mates with the not-to-sweet whipped cream.
Run, don't walk.
One drawback: I could easily eat a dozen.