Mmm, mmm, mmm.
This is the 30 year old Tawny from Fonseca. It isn't on this page, but I think that's where it would be if listed on their site. I've found a short description here.
It's reddish amber in color. The flavour is buttery, lush and dense. It tastes of butterscotch and plum, with a long finish.
I can recommend this port highly.