Mr. Pepin has been quite interested in encouraging the development of American caviar for at least the last 15 years so I'd guess it was one from here and either Paddlefish or Hackelback. I've heard there is a pressed caviar sold under his name but haven't tried it yet.
JP is my living culinary idol and I envy you the meal! Uhm err well I'll admit I take his book,
Fast Food My Way, with me when we vac on the CT shore (sometimes staying in town but mostly camping) where it is well used but somewhere in the back of my head I hope to run into him book in hand so he could sign it for me, stains and all

. The man has this story he always tells me about running into JP in the frozen food aisle of Madison's Stop and Shop. Tells it with such a great deadpanned face if you dinna know him you'd believe

.