You definitely should try it when you are here in Florence! Go to the Mercato Centrale, there is a place called Nerbone's, really popular, that is only open at lunch and serves great "panini" with the trippa and lampredotto (separately, not together).
I've never tried making it, so I don't know how hard it is.... I went in search of a recipe - many are in Italian but I found this one in English: Fork Spoon Knife: From Florence!!! Panino al Lampredotto by Juls
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