Though it may seem bewildering or even exotic to outsiders, Istanbul’s commercial life is actually organized according to a very old, guildlike system that assigns different neighborhoods to the sale and sometimes manufacture of different types of products. If you bottom out in a pothole and need a rot balans, you head up to the Oto Sanayi area. For kitchen and bathroom accessories, the Çağlayan neighborhood is the answer. And when Istanbulites hanker for grilled sweetbreads, or uykuluk, the only suitable place to go is Sütlüce, down where the slaughterhouses used to operate on the Golden Horn.

In 2008, Shanghai’s noodle scene was dealt a mighty blow. A Niang, a granny from the ancient seaport of Ningbo who was famous among local foodies for her seafood noodles, was forced to close her streetside shop after being diagnosed with kidney disease. Over the past few decades, she’d gained a loyal following; her friendly, wrinkled face was a common sight in the dining room, as she often wandered through the hordes of hungry diners to say hello to regulars or wipe up a splash of spilled soup.

Considering Athens’ position as a top tourist destination, it may come as a surprise that it is only recently that local museums have decided to up their game when it comes to their dining offerings. Worldwide, a good restaurant and café are now considered part of the whole museum-going experience, but it took a little time for Athenian museums to catch on to that, though catch on they have.

On the diner intimidation scale, Shanghai’s Chenghuang Miao Tese Xiaochi – which can be loosely translated as “City God Temple Snack Shop” – ranks pretty high, with aggressive lunchtime crowds and nothing but Chinese character-laden menus for guidance. But the payoff, a baptism by fire in authentic Chinese eating, is worth it. The hungry masses that congregate here have discovered a simple truth: the food here is quick, tasty and cheap – a gastronaut’s holy trinity.

Dear Culinary Backstreets, We will be visiting Barcelona with our children. Do you have any good recommendations of places in the city to eat with kids?

While the Princes’ Islands make for a great escape from the city, it used to be hard to think of them as a culinary destination. That is, until Heyamola Ada Lokantası opened. The restaurant is a perfect storm of inspired food, chill ambiance and small-label Turkish wines, all at ridiculously low prices.

Kadınlar Pazarı – a pleasant, pedestrian-only square in Istanbul’s Fatih neighborhood – is the closest thing the city has to a “Little Kurdistan.” The area is populated by migrants from Turkey’s predominantly Kurdish southeast region, and small market stalls and butcher shops selling honey, cheeses, spices and other goodies from the region surround the square. Visiting the atmospheric area is a great way to get a taste of Southeast Turkey without having to leave Istanbul.

At first glance, Restaurant Roma doesn’t appear to be anything out of the ordinary. The nondescript brown tiles covering the floors, the dark wood bar, the vaguely Mediterranean-inspired wall décor and the rectangular paper Ikea lamps are similar to those at hundreds of other midrange restaurants throughout Barcelona. Situated on a quiet street in residential Sant Gervasi, Roma isn’t somewhere you’d be likely to come across accidentally, nor is it the kind of place you’d happen to hear about, unless you (or your aunt, or coworker or a friend of a friend) lived nearby. And that would be a shame because the food at Roma is good – ridiculously delicious, in fact.

Lahmacun is one of those mysterious foods where a lot is created with so little. It checks all of the boxes of a perfect savory snack: crispy, oven-fired crust, light and spicy meat spread, a fresh green garnish and a tangy spray from a lemon. It’s like an artisanal pizza with a Middle Eastern topping wrapped around a side salad – for the cost of a shoeshine.

The first wave of Indian, Pakistani and Bangladeshi immigrants arrived in Athens in the early 2000s, bringing a new eating culture with them. This was a time of prosperity in Greece and consequently the first South Asian restaurants, such as the now-defunct Pak Indian, were welcomed with open arms by Greeks who were willing to experiment. It helped that an enormous number of young Greeks had studied abroad in the 1990s and early 2000s, mainly in the United Kingdom, where they were introduced to the cuisine of the Subcontinent.

When Xisca Ferragut left Mallorca (the largest of the Balearic Islands, located in the Mediterranean Sea off the eastern coast of Spain) and moved to Barcelona, she had no intention of opening a restaurant. Having lost her job back in Mallorca, she had decided to study sign language and become an interpreter. Then her boyfriend, Dionis Ballester, showed up and as the two struggled to find work, they noticed something: there were literally NO Mallorcan restaurants in Barcelona.

In Shanghai, there’s a time and a place for taking part in the city’s rough-and-tumble street food scene, but sometimes you want to eat out knowing that your bowl of noodles will not accidentally become someone’s ashtray or that you don’t have to elbow an elderly lady out of the way for a seat. Somewhere between the dive noodle stalls and the elegant confines of the city’s upscale banquet-style restaurants lies the holy grail of eating authentically: affordable local cuisine in a non-smoking, no grime, no-nonsense environment – with painted walls to boot! Meet the popular Shanghainese restaurant Jian Guo 328.

Dear Culinary Backstreets, In just about every restaurant or bar I’ve been to in Barcelona, I’ve seen a dish called “tortilla.” What exactly is a tortilla and can you recommend any places where they are done especially well? Although it would seem that much of the world imagines the inhabitants of Spain subsisting largely on paella, the truth of the matter is that it is the tortilla española, also known as tortilla de patatas (truita de patata in Catalan), that  really holds the place of honor in the hearts and stomachs of Spaniards. Often translated into English on menus as “potato omelet,” this hearty round cake of potatoes, eggs, olive oil and salt has nothing to do with the traditional French omelet, nor does it have anything in common with a Mexican tortilla. At its most basic, the Spanish tortilla is made by frying up a thick mass of sliced potatoes and eggs in olive oil and then slicing it into savory wedges.

Good service in China is a relative term, and the longer you live here, the lower your expectations sink. The Michelin Guide allegedly won’t deign to cross over the Hong Kong border into China because they refuse to sully their white-tablecloth reputation by doling out stars to restaurants with subpar service. But the inspectors must have never entered a Hai Di Lao Hot Pot, or they might have to change their tune.

Until we visited some of Istanbul’s shrines to the baked bean, we generally regarded the dish as something eaten out of a can beside railroad tracks. But Turkey takes this humble food, known as kuru fasulye, seriously; that means chefs in tall toques carefully ladling out golden beans in a rich red gravy onto monogrammed flatware, served by waiters wearing bowties and vests. Even in the least formal of Istanbul’s beaneries, the guy manning the pot has the air of a high priest who knows that his incantations alone conjure something unusually delicious out of a simple dry white legume. This is no hobo fare.