Traditionally, lahpet is offered to guests during ceremonies, to monks on their initiation, and to the gods of the forests. It was also used as a peace offering after war, as a symbol of putting the past behind.
|Image from Koocrow at Edibly Asian, see link in post body.|
The best recipe for lahpet is the one I found at Edibly Asian, which is where I borrowed the image from too.
Here is another middle of the road recipe for making pickled tea. And here is a more detailed one. If you are more of a visual learner, here is one with a video.