The vast country of China has just one time zone, so Shanghai’s East Coast location means darkness comes early and most residents usually eat by nightfall, with restaurants often closing their kitchens around 9 p.m. But for those who keep late hours, nighttime brings out a chorus of pushcart woks and mini grill stands to street corners around the city. Despite often aggressive government crackdowns on these tasty, yet mostly unlicensed, food stands, the migrants who run them are determined to make a living and feed the masses while they’re at it. Our top five list goes beyond these roving vendors to feature a mix of restaurants that stay open late and small family-run gems that cater exclusively to the night-owl crowd.

Editor’s note: As of this week, Rio de Janeiro joins Culinary Backstreets as our sixth city. We’re thrilled to have expanded to four continents, and are looking forward to sharing with readers our explorations of this exciting city's dynamic food scene. Like many things in Brazil's beachside, party-hard Carnival city of Rio de Janeiro, gastronomy has a hedonistic edge to it.

Editor’s note: This post wraps up our special series this week featuring our top street food picks in all of the Culinary Backstreets cities. As rapidly as Istanbul marches toward its modern destiny, street food in this city is still served the old-fashioned way, by boisterous ustas with a good pitch and, sometimes, a really good product.

Editor’s note: This is the fourth installment in our street food series this week, featuring dispatches on the best streetside eating in all the cities Culinary Backstreets covers. Before we get down to the business of discussing the best of Athens’ street food, a disclaimer: Athens is at a disadvantage when it comes to streetside eats. For one thing, a lot of venues – souvlaki joints, pizza parlors and even offal soup places – are open all night or even 24/7; they are just not serving on the street, though.

Editor’s note: This feature from Barcelona is the third installment in our series this week devoted to the top street foods in each of the Culinary Backstreets cities. In Barcelona, a great deal of eating is done in the streets. Sidewalk cafés line the plazas and paseos, often to the point that it’s difficult to tell which tables belong to which establishment.

Editor’s note: This feature from Mexico City is the second installment in our street food series this week, highlighting the best streetside eats in each of the cities Culinary Backstreets covers. 1: Pambazos The pambazo is a Mexican sandwich that’s similar in style to the more familiar torta, but not nearly as ubiquitous. Most commonly found at weekly street markets like Sullivan, pambazos are made with hard, white bread rolls soaked in guajillo chili sauce that softens the crust and gives it a warm, orange-red hue. Once dried, the bread is sliced in half and then filled with a generous portion of diced potatoes, chorizo, lettuce, sour cream and sprinkled queso fresco. The bread is quite fragile, so eating the concoction can be somewhat challenging. From the first bite the pambazo starts to disintegrate, and by the end we’re usually scooping up the heavy mess with our fingers. It’s all worth it, though, as the light hint of chili in the bread and the hearty ingredients inside give the dish the same satisfying and belly-filling pleasure that comes with a good bowl of thick stew.

Editor’s note: This week we are celebrating street food, in all its fascinating, delicious and sometimes offbeat forms. Each day, we’ll take a look at the top street foods in a different city that Culinary Backstreets covers. This feature from Shanghai is the first installment. 1: Shengjianbao A Shanghai specialty, shēngjiān mántou (生煎馒头) – or shēngjiān bāo (生煎包), as they’re known everywhere else in China – are juicy pork buns wrapped in bread dough, then arranged in a flat, oil-slicked wok in which the bottoms are deep-fried till they are crispy. Although shengjian mantou can be found on most street corners in the morning, we’re especially fond of the delicious misshapen buns at Da Hu Chun. A Chinese Time-Honored Brand (老字号, lǎozìhào), Da Hu Chun has been splattering grease since the 1930s and, nearly 80 years later, has six restaurants across Shanghai. The venue’s chefs use the rare “clear water” technique, frying the pinched side of the dough face-up to create little Frankenstein buns that might not be as photogenic as the more common “troubled water” variety, but that have a thinner skin that gets extra crisp – and we’ll sacrifice good looks any day if it means better flavor.

Dear Culinary Backstreets, I heard that the Monday on which Lent begins is a holiday in Greece and that there are some special culinary traditions. Is this true? What do Greeks eat on this day?

Once a resort town on the outskirts of the Greek capital, Phaleron – only a few miles from downtown Athens – is now well incorporated into the city’s urban fabric. The area has remained an upscale neighborhood, but, sadly, it has lost its distinctive character: the sea is now polluted, the open-air cinemas have been turned into parking lots, and many of the stately mansions were demolished to make way for apartment blocks during the construction boom of the 1960s.

As the legend goes, a 19th-century Catalan farmer was out experimenting in his fields when he came up with a new kind of longer, juicier green onion, the calçot. In creating the onion, the farmer produced much more than a new vegetable; he also paved the way for the rise of an idiosyncratic, and distinctly Catalan, cultural event.

After four years of publishing weekly dispatches from Istanbul’s culinary backstreets (on IstanbulEats.com and now on this site as well), we are still regularly surprised by new discoveries, impressed by the staying power of old standards and shocked by how quickly so much can change. For better or for worse, it is that dynamism that Istanbulites line up for, and the city never seems to run short on it. Heading into 2013, we are licking our chops in anticipation of the expected and the unexpected, which are always sure to be delicious, or at least interesting. Here are our Best Bites of 2012.

The past year has been a very good one for food in Mexico City. We’ve had a wonderful time exploring new restaurants, tracking down exciting dishes and meeting great people along the way. There have been so many memorable moments over the past year that it was hard to sit down and come up with a list of the ones that really stood out the most. Through debate and discussion (and some revisits), we narrowed down the worthy field to our top favorites. Here are our Best Bites of 2012 from Mexico City. El Pozole de Moctezuma First up on our best food experiences of the year would have to be the pozole at El Pozole de Moctezuma. Located near Metro Garibaldi, the building is nondescript and shows no sign of the deliciousness that lies within, so if we hadn’t been taken there by a friend, we never would have known about it. But what a discovery! The friendly staff showed us exactly how to build the perfect bowl of pozole, from choosing the color and flavor of the broth to adding oregano, chili powder, lime juice and, of course, a splash of mezcal. A bowl of soup never tasted so good or filled us up more satisfyingly than that at El Pozole de Moctezuma. Best of all, the place is a long-term neighborhood fixture that celebrated its 65th anniversary in 2012, a fact that bodes well for future visits.

Editor’s note: This post is the first installment of “Best Bites of 2012,” a roundup of our top culinary experiences over the last year. Stay tuned throughout this week for “Best Bites” from all of the cities Culinary Backstreets covers. Hai Di Lao Hot Pot Restaurant We’re usually loathe to mention a restaurant that has locations all around China, but we were blown away by the dedication to customer service here – something that is sorely lacking in China. Too often, it’s a choice between authentic flavors or service. Not at Hai Di Lao.

While Athens’ more upscale neighborhoods have recently rediscovered the gastronomic joys – and, let’s face it, the economic sense – of eating souvlaki, this classic dish has never gone out of fashion in Athens’ downtown. The city’s longtime souvlaki venues may have changed little in the last 50 years, but there is something particularly satisfying about their old-fashioned, no-frills approach. With their clientele of seasoned fanatics, the best of the bunch offer a lesson in what it truly means to eat like an Athenian. (Keep in mind that the menus at these old-school souvlaki places have remained virtually unchanged for decades, meaning that there is no chicken served, only the traditional pork or “kebab” – usually made with a mixture of minced veal, lamb and sometimes pork – in variations described in our Athenian souvlaki primer.)

Dear Culinary Backstreets, What and where is safe to eat in Mexico City? We’ve heard horror stories from other travelers about “Montezuma’s Revenge” and would like to avoid getting sick while visiting the city.