I was, however, happy to realize my suspicions about the most inescapable street food were correct: One of the young masterminds behind Istanbul Eats agreed when I said the grilled corn on the cob had to taste like burned starch. Because of the heat, he and someone else warned me off the tempting stuffed mussels for sale everywhere.  And I can’t remember who killed Bob’s appetite for the grilled mackerel sandwich he was lusting after in the fish restaurants under and near the Galata Bridge by saying the main ingredient comes from horrifically polluted water. I didn’t know until just now that My Biggest Fan did an Istanbul episode. Apparently he too had reservations.