karaköy
Tarihi Karaköy Balıkçısı in Perşembe Pazarı, the 1923 fish counter inside an old hardware market, grilling sole and bonito on skewers for twelve seats.
Why locals love it: Hidden inside the Perşembe Pazarı hardware-market arcades, with only about a dozen seats inside the original Griffin Han.
Tip: Aim for 12:30 to grab a table; the kitchen closes when the morning catch sells out.
fatih
Bahar Restaurant inside a Yağcı Han courtyard, an esnaf lokanta feeding bazaar working merchants from steam-table stewpots that empty by mid-afternoon.
Why locals love it: Buried in a small han off the Grand Bazaar's Nuruosmaniye gate, found only by the bazaar merchants who eat there daily.
Tip: Get there before 14:00 or the stewpots are empty.
beyoğlu
Antiochia on a Beyoğlu side street, an Antakya (Hatay) kitchen plating southeastern grills and Levant mezze from a tight Asmalımescit address.
Why locals love it: Tucked on a tight General Yazgan side-street in Asmalımescit, often walked past on the way to bigger meyhanes.
Tip: Order the cevizli biber, the kunefe and the cag kebab together.
beyoğlu
Mandabatmaz in Olivya Geçidi, a one-table Beyoğlu Turkish coffee bar running since 1967, the cup of foam so dense the buffalo doesn't sink.
Why locals love it: Tucked inside the Olivya Passage off Istiklal, easy to miss for anyone not looking for the unmarked alley.
Tip: Order an orta-şekerli (medium-sweet) and stay for two; the kahveci will keep refilling water.
edirnekapı
Asitane in Edirnekapı, an Ottoman palace-cuisine specialist working from 16th-century archives, a 45-minute taxi from the tourist core and worth it.
Why locals love it: Out beyond the Chora Church in Edirnekapı, far from the tourist Sultanahmet circuit and the Bosphorus.
Tip: Book a day ahead and try the goose dolma; only a handful of kitchens in Turkey still cook it.
sarıyer
Sade Kahve below the Rumeli Hisarı battlements, an all-day Bosphorus terrace where ash-brewed Turkish coffee meets a full kahvaltı board.
Why locals love it: Right under the Rumeli Hisarı walls, far enough up the Bosphorus that most day-trippers never make it.
Tip: Come on a weekday morning for the kahvaltı; the terrace fills by 11 on weekends.