Dishes that represent an entire country abroad usually originated in one small region of it. The promotion from local speciality to national symbol follows a recognisable sequence.
Migration exports a regional kitchen
Emigration is rarely evenly distributed across a country. It draws disproportionately from particular provinces, often the poorer or more coastal ones.
The cooking that travels is therefore the cooking of those specific places, carried by people who opened restaurants because it was work available to newcomers.
Diners abroad encounter that regional repertoire and reasonably conclude it represents the whole country, since they have no other reference point.
Restaurant economics narrow the repertoire further
A restaurant serving an unfamiliar cuisine needs dishes that survive substitution of ingredients, hold well during service and appeal on first encounter.
Preparations that depend on a specific local ingredient or on eating immediately at the point of cooking rarely survive the transition and quietly drop off menus.
What remains is a shortened, more robust version of the original repertoire, which then becomes the reference version in the new country.
The dish returns home transformed
Once a dish is internationally famous, domestic demand for it grows in regions that never cooked it, driven partly by visitors expecting to find it.
Restaurants in the capital and in tourist districts add it regardless of local tradition, and the national association strengthens with every menu that lists it.
Cooks in the region of origin frequently object to the version that comes back, which is a recurring and largely unresolvable argument in most food cultures.
States participate deliberately
Tourism boards and agriculture ministries promote specific dishes because food is an effective and inexpensive way to make a destination legible abroad.
Protected designation schemes, official recipe standards and heritage nominations all function as instruments in that promotion as well as in conservation.
The dish selected is usually the one already recognised internationally, which reinforces the existing hierarchy rather than reflecting domestic eating habits.
What this means for eating well while travelling
The national dish is usually worth eating, but it is rarely the most interesting thing available in any given town.
Asking what is eaten locally rather than what the country is known for tends to produce a different and shorter list, tied to the season and the surrounding land.
Markets and daily-menu restaurants reveal that list faster than any guide, because both are constrained by what arrived that morning.