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In Hanoi, soup is a way of life - the connective tissue of Vietnamese culture. With noodles, herbs and sinew, it strings together twisting streets and varied lifestyles. Here the bones, crumpled napkins and squeezed limes that litter the ground beneath tiny plastic tables are symbols of a good meal and a life well lived.

I came here in early December largely because of Hanoi's growing reputation as a culinary capital. In 2010, the website Sherman's Travel ranked Hanoi, Vietnam's second-largest city after Ho Chi Minh City, as the No. 2 foodie destination in the world, behind Barcelona, Spain, and ahead of Rome and Tokyo.

Pho - rice noodles in savory broth with a variety of meat and herbs - is Vietnam's national dish, and bun cha - a combination of grilled pork, sweet and savory broth with fish sauce, sliced green papaya, rice noodles and fresh herbs - is the signature dish of Hanoi. Besides these belly-warming staples, you can satisfy your appetite with all manner of noodle soups for breakfast, lunch and dinner.

The abundance of options makes looking for the perfect bowl of noodles in Hanoi a tricky one. It's a quest that will lead you through the city's back alleys, grand French-influenced boulevards and tucked-away neighborhoods. In searching for sustenance, you'll find religion, history, art and the theater of everyday life as it plays out on the scooter-packed streets.

I decided to stick to the city's ubiquitous street stalls, and I vowed to eat whatever was set before me, no matter how mysterious. I did, however, sample some upscale noodles aboard an overnight junk cruise on stunning Halong Bay. The UNESCO world heritage site is a three-hour drive from the city and home to an otherworldly web of limestone islands, caves and emerald waters. And I dumped an entire bowl of soup in an alley when the old woman who served me wasn't looking because I thought I spotted an eyeball staring up at me from the broth.

A bowl of soup on the street in Hanoi usually sells for VND15,000-25,000 (72 cents to about US$1.20 ) so eating this way here is a steal. By contrast, a bowl of simple and comparatively bland pho ga (with chicken) or pho bo (with beef) at the elegant French colonial Hotel Metropole goes for about US$12.50 and comes with a side of wealthy tourists chatting on their cellphones.

Reporter Jessica Gelt

To help me gauge which street stalls were superior, I enlisted the help of Mai Thi Thu Trang, a young woman who manages the Arriba Mexican Restaurant & Grill, one of Hanoi's few (and maybe only) Mexican restaurants. Over puffy fried chips and tamarind-based salsa, Trang gave me a bit of advice that guided my quest.

"Places that are good are normally places that old people come to eat," Trang said. "Because they believe in the quality."

Early the next morning, she took me to a stall that she said served some of the best breakfast noodles in the city. It was deep in the Old Quarter, a collection of 36 tightly knit streets that retain the layout and much of the architecture of early 20th century Hanoi, with roots stretching as far back as the 11th century when the city was established by King Ly Thai To.

Historically, each street in the Old Quarter attracted and was named for a type of artisan or merchant, such as silk traders, jewelry makers or blacksmiths, and many of the streets retain these clusters, although commercialism and a thriving tourist trade now define much of the quaint area. Still, strolling the Old Quarter is one of the great joys of Hanoi.

I was particularly taken with the warren-like streets surrounding the Dong Xuan Market, where I ducked into stalls to gawk at buckets of writhing fish, chicken claws and exotic herbs and spices. I bought a puffed sesame baguette and munched on it as I roamed, ending in the cold quiet of the Bach Ma temple, said to be the oldest place of worship in Hanoi.

Dong Xuan market

Trang led me through the chaos of these streets, turning off Hang Buom into tiny Ta Hien Street. There she pointed out a small shop (No. 2C) — about the size of a walk-in closet in Beverly Hills — where a wizened old woman in traditional dress and a conical straw hat sat eating on the high stoop (a good sign). She beckoned me to sit on a knee-high plastic blue stool at a similarly doll-sized table beneath a small framed picture of Ho Chi Minh. A younger woman sat on another stool above two steaming pots.

One pot was filled with broth into which she put noodles plucked from inside a glass case that held bowls of brown eggs, salt, chopped green onions, plates of pig's feet, sliced pork and raw meatballs. I didn't order; she just made a bowl of noodles, broth, a dash of salt, a sprinkling of herbs, pickled garlic, meatballs and slices of soft pork and handed it to me.

Jessica Gelt