I was alerted that this pop-up was going on at Tokyo Fish in Berkeley. For $9, I got a flavorful bowl of mild broth, a couple of slabs of roast pork, nori, a medium-boiled egg and various garnishes.
(not my photo)
He also has more intense versions of the broth, and I wish I’d written them down. There’s seating for about five people on a folding table.