Coffin Toast?

Had been eyeing on this dish in the menu, but never eat before. So today, went to this Taiwanese cafe with colg to have lunch, and I finally ordered the "COFFIN TOAST". It really looks so nice and tempting.
BUT VERY DISSAPOINTING, I don't like the taste. I thought the inner gravy would taste like mushroom soup, but it was not. It was a bit sour, not salty, then well...I really don't know how to describe. "Weird" is the right word I think. Guess I have too much expectation, and end up it becomes an unexpected turn of bad lunch...