Well, it finally happened. I hit upon a recipe I won't make again.
Pastitsio can be described crudely as "Greek lasagna", it has marinated beef, elbow macaroni, topped with a creamy bechamel sauce. It was ok, but I don't spend almost two hours on a dish for it to be just ok. The bechamel sort of sat on top of the meat and macaroni mixture. Also it took forever to make, at least 90 minutes. It was all in all underwhelming. I do enjoy it when Greek friends who have some idea what they're doing make it but pastitsio -- never again.
The recipe I used is here.