Ask almost anyone outside Spain to describe chorizo and you will get the same answer: a red, spicy Spanish sausage. Every part of that answer needs correcting. For most of its documented history the sausage was not red. It is not necessarily spicy, and in Spain the mild version outsells the hot one. And it is not one sausage at all. Spain legally protects two chorizos by name, and Pamplona cures a third of its own, one so distinct that Spanish food law gave it a dedicated quality standard in 1980.
Holding the wrong picture costs you at the counter and at the bar. It leads visitors to grill a cured Spanish chorizo that was made to be eaten raw in thin slices, to confuse it with Mexican chorizo, which is a completely different fresh product, and, worst of all in Navarra, to point at a txistorra and call it chorizo. Locals will forgive the last one exactly once.
This article draws on the Gran Enciclopedia de Navarra, the protected designation records of Spain’s Ministry of Agriculture and the Boletín Oficial del Estado, and the Real Academia Española’s historical dictionaries, which have been defining this sausage since 1726.
Chorizo Was a White Sausage First
Cured pork sausages existed on the Iberian peninsula since Roman times, but they were pale. The ingredient that defines chorizo today, pimentón, could not exist in Europe before 1492 because the peppers it is ground from are American plants. A sixteenth century Castilian recipe records chorizo made from minced pork, garlic, cloves, white wine, and salt, then smoke dried. There is no pimentón in it, and no red color.
The word itself is first attested in Spanish in 1604, borrowed from the Portuguese chouriço and Galician chourizo. Pimentón entered the recipe somewhere between the late sixteenth and early seventeenth centuries, as dried and ground American peppers spread through Spanish kitchens. By 1624 the transformation was far enough along that Francisco de Quevedo could write of “negros chorizos,” dark chorizos, as a familiar sight. In 1726 the Real Academia Española’s Diccionario de Autoridades gave the sausage its first dictionary definition: a short casing filled with minced, seasoned pork, usually cured in smoke.
So the red sausage the world considers ancient and essentially Spanish is, in its current form, roughly four centuries old, and it owes its identity to an American crop. The Spanish sausage everyone recognizes is younger than the Pamplona city hall building the txupinazo is fired from.
What Spanish Chorizo Actually Is
Modern Spanish chorizo is a cured or semi-cured sausage of chopped pork and pork fat, seasoned with salt, garlic, and above all pimentón, which supplies the color and the base flavor. It comes in two registers: dulce, made with sweet pimentón, and picante, made with hot. The choice of pimentón, not chile heat added separately, is what decides whether a chorizo bites.
Beyond that shared definition, the variety is enormous. Chorizos are stuffed thin or thick, strung in horseshoe loops or hung straight in the candle shape Spaniards call vela, smoked or simply air dried, aged for weeks or for months. Fully cured pieces are firm enough to slice and eat as they are, on bread, on a tapa, or from the cured meat counter alongside the hams whose labels deserve their own reading, as covered in our guide to jamón serrano and jamón ibérico. Softer, semi-cured chorizos are for the pot: crumbled into stews, simmered into cocido, or cooked whole in cider, the Asturian classic chorizo a la sidra that shares its liquid with the sidra poured in Pamplona’s own cider houses.
None of this describes Mexican chorizo, which shares the name and little else. The Mexican product is a fresh, uncooked sausage seasoned with native chiles and vinegar. It must be cooked, it crumbles rather than slices, and substituting one for the other ruins the dish in either direction.
The Two Chorizos Spain Protects by Name
Spain does not treat chorizo as a single national product, and neither does European food law. Two chorizos carry a Protected Geographical Indication, the same legal instrument that protects names like Idiazabal cheese.
IGP Chorizo Riojano covers chorizo made across 174 municipalities of La Rioja, the wine region an hour south of Pamplona. It received national transitional protection in 2009, published in the Boletín Oficial del Estado, and its rules require the traditional horseshoe form and exclude additives the industrial versions lean on.
IGP Chorizo de Cantimpalos protects the chorizo of 72 municipalities in Segovia province, with its specifications ratified by ministerial order in 2007. Its base is fatty pork with salt and pimentón, with garlic and oregano as the only permitted extras.
Navarra’s neighbor makes one of the two protected chorizos of Spain. Navarra itself never sought an IGP for its most famous cured sausage. It did something more unusual instead.
Chorizo de Pamplona: The City’s Own Sausage
Chorizo de Pamplona is the exception to almost every rule stated above. Where other chorizos are coarsely chopped, Pamplona’s is ground fine. Where most are stuffed into casings of 30 to 35 millimeters, Pamplona’s must measure at least 40. In 1980 it received its own Norma de Calidad, a dedicated quality standard under the Spanish food code, which defines it precisely: pork, or pork and beef, with the fat diced fine to an average of three millimeters, so that a cut slice shows the fat scattered through the deep red meat like grains of rice. It is stuffed straight in the vela shape, smoked, and matured slowly.
The Gran Enciclopedia de Navarra records that the curing runs to around three months in traditional practice, longer and drier than an ordinary chorizo, with no anti-mold treatments. The result is a natural white bloom on the skin, the flor natural, that producers consider part of the product. Pamplona’s cool climate is credited with making that slow cure possible at all. The city’s sausage industry organized around it early: industrial production began around 1930, and by the mid 1980s Navarra counted 59 processing firms producing nearly 63,000 tonnes a year, more than half of it in the basin around Pamplona.
Chorizo de Pamplona is eaten one way only: raw, sliced thin. Cooking it is simply a mistake. And it carries a genuine fiesta tradition. In the era of the household matanza, when Pamplona families slaughtered and cured their own pig, custom held that the first chorizo of the batch was cut after the Corpus Christi procession in early summer. The cular, the prized final piece stuffed into the widest end of the intestine and considered the masterpiece of the batch, was saved for July 7, the day of San Fermín. The encyclopedia notes the custom is still kept.
Chorizo Is Not Txistorra
The sausage a visitor is most likely to eat during San Fermín is not chorizo at all. Txistorra, also written in Spanish as chistorra, is Navarra’s own thin sausage: stuffed into thin lamb casing under 25 millimeters, cured for days rather than for months, and always cooked before eating, usually fried or grilled and folded into bread. It is faster, fattier, and fresher than any chorizo, and it has its own full story, told in our article on why txistorra is not chorizo.
The practical rule is simple. If it is thin as a finger, sizzling, and served hot in bread at a fiesta stand, it is txistorra. If it is thick, firm, deep red, and sliced cold, it is chorizo, and if the slice shows fat like grains of rice, it is Pamplona’s own.
Frequently Asked Questions
What is Spanish chorizo made of?
Spanish chorizo is made of chopped pork and pork fat seasoned with salt, garlic, and pimentón, the Spanish paprika that gives it its red color, then cured by air drying and often smoking. Chorizo de Pamplona may combine pork with beef under its 1980 quality standard. The sweet or hot character comes from the type of pimentón used, dulce or picante.
What is the difference between Spanish chorizo and Mexican chorizo?
Spanish chorizo is a cured sausage seasoned with pimentón that can be eaten raw when fully aged. Mexican chorizo is a fresh, raw sausage seasoned with native chiles and vinegar that must be cooked and crumbles when it is. They share a name through colonial history but are not interchangeable in any recipe.
What is chorizo de Pamplona?
Chorizo de Pamplona is the city’s own variety of chorizo, defined by a dedicated Spanish quality standard since 1980. It is finely ground pork, or pork and beef, with fat diced to about three millimeters, stuffed into a casing at least 40 millimeters wide, smoked, and slowly cured. It is eaten raw in thin slices, never cooked, and a cut slice shows the fat like grains of rice.
Can you eat Spanish chorizo without cooking it?
Yes, if it is a fully cured chorizo. Cured chorizo is preserved by drying and is meant to be sliced and eaten as it is, like salami. Semi-cured and fresh cooking chorizos, sold soft, are meant for the pan or the stew pot. Txistorra, the thin Navarran sausage often confused with chorizo, must always be cooked. Navarra’s blood sausage has a similar identity problem, except worse: what gets sold as morcilla de Navarra is actually three unrelated sausages, not a single regional variant.
Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.