In the evolutionary process of the Istanbul fish restaurant, there was a moment in the late 1990s when the amphibious, shore-hugging boat restaurants crawled out of the Bosphorus and became land dwellers. Overnight, yellow Wellington boots became black loafers as seafaring grill men became restaurateurs and waiters.

[Editor's note: We're sorry to report that A Da Cong You Bing has closed.] In China, where queuing isn’t part of the culture, a long line of hungry diners patiently waiting for their food is just about the highest compliment a restaurant can receive. By those standards, Mr. Wu’s scallion oil pancakes are, hands down, one of the most sought-after breakfast treats in Shanghai. The line that stretches out his kitchen’s back door and wraps around the street corner means that fans of his savory pancakes can wait for hours, gulping in the scallion-scented air as they look forward to their chance to sink their teeth into the real thing. Scallion oil pancakes (葱油饼, cōngyóubǐng) are a common breakfast treat in Shanghai, but when Mr. Wu makes them, the little savory rounds stuffed with salty pork and scallions become an art form.