I would just like to say thanks to the chowhounds on this board for praising Tu Y Yo.
On your recommendations I went last night!
Had the chicken stuffed with Huitlacoche in a green sauce and my buddy had slivered steak simmered with onions in a piquant sauce.
Flan for dessert.
Added up to the best mexican meal I have ever had in Boston. Going back soon!
Thanks to the chowhounds who found this place.