Vietnam is 1,650 kilometres long from the Chinese border in the north to the Mekong Delta in the south, shaped roughly like an elongated S along the South China Sea, and the food changes so completely every few hundred kilometres that a person who ate only in Hanoi and then only in Ho Chi Minh City would struggle to identify the two cuisines as belonging to the same country. This is not hyperbole. The broths are different — northern Vietnamese broth is clear and pure, southern Vietnamese broth is sweeter and richer. The herbs are different — the north uses fewer fresh herbs than the south, which piles them onto every dish in quantities that would seem excessive anywhere else. The noodles are different. The dipping sauces are different. The chilli use is different. The sweetness level is different. Even the pho — the dish most associated with Vietnam internationally — tastes different in Hanoi than it does in Ho Chi Minh City, and the difference is not subtle. Understanding Vietnamese food as a single cuisine is like understanding Italian food as a single cuisine — technically accurate at the level of national borders, practically misleading as soon as you start eating. The north, the centre, and the south of Vietnam have distinct culinary identities, distinct signature dishes, and distinct philosophies about what food is for and how it should be seasoned. Here is the regional map.

The North: Hanoi’s Restraint and the Purity of the Broth

Northern Vietnamese food is the most restrained of the three regional cuisines — the least sweet, the least herb-heavy, the most focused on the quality of the broth and the freshness of a small number of carefully chosen ingredients rather than the abundance of condiments and additions that characterise the south. The pho of Hanoi is the argument for this restraint: a clear, clean beef broth made from bones roasted until dark and then simmered for hours with charred ginger and onion, star anise, cinnamon, cloves, and rock sugar, served over flat rice noodles with thin slices of beef (either rare, added raw to the hot broth, or well-cooked from the pot) and a plate of bean sprouts, fresh herbs, and lime on the side. The Hanoi pho purist will tell you that the southern version — sweetened with hoisin, loaded with herbs, served with a plate of additions that dwarfs the bowl — is a corruption of the original, and while this is a position with as much cultural politics as culinary philosophy behind it, the purity of a bowl of Hanoi pho made from a broth that has been cooking since 4am is an experience that is difficult to argue with. Bún chả — the Hanoi dish of grilled pork patties and pork belly served in a bowl of diluted fish sauce dipping broth with vermicelli noodles and fresh herbs, made famous internationally by a specific lunch — is the lunch dish that every visitor to Hanoi should eat, from the charcoal-grilled street stalls that produce it best. Chả cá Lã Vọng, the turmeric-and-dill fish dish that a single Hanoi family has been serving in the same restaurant on the street now named after the dish for over a century, is one of the most specific and most memorable things to eat in northern Vietnam: fish cooked at the table in a sizzling pan of turmeric-stained oil with dill and spring onions, eaten with rice noodles and a fierce shrimp paste sauce.

The Centre: Hue’s Imperial Kitchen and the Most Complex Food in Vietnam

Hue was the imperial capital of the Nguyen dynasty from 1802 to 1945, and the food culture that developed to serve the imperial court was the most elaborate and the most demanding in Vietnam — a cuisine of dozens of small dishes, intricate presentations, and a complexity of flavour that reflects the court’s requirement that food be both a culinary and an aesthetic experience simultaneously. The imperial food tradition survives in Hue’s restaurant culture in attenuated but genuine form, and the city has a specific relationship with its own food that no other Vietnamese city quite matches: Hue people eat in Hue, by which is meant that the dishes of Hue are specific to Hue, are made there better than anywhere else in the country, and are consumed by locals with a seriousness and a pride that makes the question of where to eat a significant one. Bún bò Huế — the Central Vietnamese beef noodle soup — is the clearest illustration of how different Central Vietnamese food is from the north: the broth is dark, complex, coloured red-orange with annatto and deeply savoury with shrimp paste and lemongrass, far more aggressive in flavour than Hanoi’s clear pho broth. The noodles are round and thick rather than flat. The toppings include pork blood cubes and pork knuckle alongside the beef, and the heat level, from fresh chilli and chilli oil, is significantly higher than anything in the northern repertoire. Bánh khoái — the Hue crispy rice crepe filled with shrimp, pork, and bean sprouts, smaller and more intensely seasoned than the southern bánh xèo — and the hundreds of bánh (rice flour preparations, steamed or fried, savoury or sweet) that are the street food of Hue and that exist in forms specific to this city and nowhere else in Vietnam, are what you eat your way through over several days, with the Dong Ba Market as your guide.

Hoi An: The Town Where the Noodle Has Its Own Water Source

Hoi An is a small UNESCO-listed trading port in Central Vietnam, preserved from the 15th and 16th centuries when it was the most important port in Southeast Asia, and its food is as specific and as historically layered as its architecture. Cao lầu is the dish that belongs entirely and exclusively to Hoi An — a bowl of thick, square-cut rice noodles with a chewy texture that, according to the food mythology of the town (which is also, more or less, the food reality), can only be achieved using water drawn from the Bá Lễ well, an ancient Cham well in the centre of the old town. The noodles are topped with slices of char siu pork (a Chinese influence on this historically Chinese-trading-community town), crispy fried rice crackers, fresh bean sprouts, herbs, and a small ladle of dark, slightly sweet broth. It is not a soup — there is not enough broth to constitute a soup — but rather a dressed noodle dish in which the broth is a seasoning rather than a medium. The white rose dumpling (bánh bao vác) is the other Hoi An dish: a translucent steamed dumpling of rice paper folded into the shape of a rose, filled with minced shrimp, served with a crispy shallot garnish and a sweet fish sauce dip, produced in significant quantities by a single family in Hoi An who are said to hold the recipe exclusively. Mì Quảng — the broad rice noodle dish of the wider Quảng Nam province, served with a small amount of turmeric-coloured broth, grilled pork or shrimp, roasted peanuts, and a sesame rice cracker — is the everyday noodle dish of central Vietnam and the one that most clearly shows how the region’s food sits between the purity of the north and the abundance of the south.

The South: Ho Chi Minh City and the Abundance of the Mekong

Southern Vietnamese food is sweeter, more abundant, more herb-heavy, and more Chinese-influenced than the food of the north or the centre, reflecting the Mekong Delta’s extraordinary agricultural productivity (the south produces the majority of Vietnam’s rice, fruit, vegetables, and freshwater fish), the Chinese communities of Cholon (Ho Chi Minh City’s Chinatown), and a climate so tropical that the produce grows in quantities that encourage generosity. The southern pho arrives with a plate of bean sprouts, fresh basil, saw-tooth coriander, lime, and chilli that is larger than the bowl — the expectation being that you will add everything to the soup and the soup will become something quite different from what it started as. Bánh mì — the Vietnamese sandwich made from the baguette-style bread that French colonialism introduced and that the Vietnamese kitchen completely transformed — is at its most elaborate in Ho Chi Minh City: the bread at its crispiest, the fillings at their most varied (pâté, head cheese, grilled pork, pickled daikon and carrot, fresh coriander, jalapeño, mayonnaise), the whole thing assembled with a speed and precision that suggests the sandwich makers have been doing exactly this for their entire working lives, which many of them have. Hủ tiếu — the southern noodle soup of clear pork broth with rice noodles, pork, shrimp, and the dried shrimp and fried shallots that are characteristic of southern Vietnamese seasoning — is the breakfast that Ho Chi Minh City runs on, eaten at the plastic stool tables of the neighbourhood shops before the city properly begins its day.

Vietnam’s regional food differences are not regional variations on a theme. They are distinct culinary languages that share an alphabet — fish sauce, rice, fresh herbs, the fundamental umami of fermented shrimp paste — and use it to say very different things. The restraint of the Hanoi broth, the complexity of the Hue imperial kitchen, the specificity of Hoi An’s well-water noodles, and the abundance of the southern table are four different relationships with food, four different answers to the question of what a meal should do for the person eating it. The correct approach is to eat in all four places, in order, moving south with the country’s geography, and to notice what changes and what stays the same. What stays the same is the fish sauce and the rice. What changes is everything else.