Every time someone at San Fermín asks for “the little chorizo,” they are not getting txistorra. They are getting something else, probably a substitution from a bar that did not bother to correct them, and they have missed the point. Txistorra is not a smaller, softer version of chorizo. It is a different product with a different composition, a different casing, a different curing time, and a completely different cultural role in the life of Pamplona.
That distinction matters because the almuerzo at San Fermín, the mid-morning meal that follows the encierro and takes place at long wooden tables set up on the streets of the Casco Viejo, is built around txistorra. Huevos con txistorra. Bocadillo de txistorra. Pintxo de txistorra. If you do not know what the thing actually is, you do not know what you are eating, who made it, why it is served at this meal and not another, or what makes the version in front of you worth ordering over the packaged alternative from a supermarket shelf.
This article draws on the full technical specification of the 2024 EU Protected Geographical Indication, the etymological and historical research of the Basque Gastronomy Academy, market data from Reyno Gourmet (the official Navarra food quality authority), and nineteen years of direct fiesta experience to build the complete record of what txistorra is, where it came from, how it is made, and where to eat it during San Fermín.
The Two Spellings: One Sausage, Two Languages
The first confusion to clear: txistorra and chistorra are the same product. They are not different sausages, different preparations, or different regional variants. They are the same thing spelled in two languages.
Txistorra is the Basque (Euskara) spelling. Chistorra is the Spanish spelling. Both are legally recognized in the EU Protected Geographical Indication, which carries three official names: Chistorra de Navarra / Txistorra de Navarra / Nafarroako Txistorra. This project leads with the Basque spelling because the product is Basque-Navarran in origin and the Basque orthography is both the older form and the one that distinguishes it more clearly from generic Spanish sausage vocabulary.
The word itself has a layered history. The Basque Gastronomy Academy scholar Juan José Lapitz, writing in El Diario Vasco in December 2015, traced the chain: txistorra comes from the Basque txistor (thin sausage), which derives from txitxa, a diminutive, which in turn is a reduction of saltxitxa, the Basque rendering of longaniza, the Spanish word for a thin, elongated sausage. Further back, the root is Latin: lucanicia, the sausage from Lucania (the region of present-day Basilicata in southern Italy), which Roman legions carried across the empire and which eventually settled into Basque food culture as lukainka.
That last word is important. Lukainka is the older, correct Basque name for what is now commonly called txistorra, and Lapitz argues that txistorra as a word only became popular vocabulary in recent decades. For centuries, the sausage was lukainka in Basque or choricillo in Spanish. The modern name solidified, and the old one retreated to the interior of academic discussion.
What did not retreat is the sausage itself.
Where It Came From: The Matatxerri
Txistorra was born from the matatxerri, the Basque-Navarran word for the traditional annual pig slaughter (txerri ilketa in Basque, matanza del cerdo in Spanish). For centuries in rural Navarra and the Basque country, the matatxerri was a calendar event: a day in late autumn or winter when a household slaughtered a pig and processed every usable part of the animal. Nothing was discarded. The fat went to soap or lard. The blood went to morcilla. The intestines became casings. The meat and offal became txistorra, chorizo, and pâté.
The social structure of the matatxerri was fixed: men handled the slaughter and butchering, women processed. It was also communal, with neighbors coming together to help, and the shared work meant shared food. An Arbizu Txistor Eguna report from 2014 describes local women still demonstrating traditional txistorra-making at the festival: Lourdes Txueka, Amparo Marín, Bittori Goikoetxea, Nati Otxaerrarte, Inés Satrustegi, their names preserved in a news account of what could easily have remained an invisible domestic tradition.
The original txistorra used the parts of the pig that were least valued for direct consumption: liver, lungs, heart. These were mixed with lean meat, salt, garlic, and available spices, stuffed into thin lamb intestines, and left to dry for a short period. This is why the oldest form of txistorra was a peasant and shepherd’s food: portable, calorie-dense, and made entirely from what the farm produced.
The transformation that gave txistorra its modern character arrived from the Americas. Pimentón, made from dried and ground capsicum peppers introduced to Spain after 1492, reached Navarra during the 16th or 17th century and fundamentally changed the product. The bright red color that now defines txistorra is from pimentón. The particular fragrance is from pimentón. Before it arrived, the sausage was a paler, earthier product.
Reyno Gourmet notes that the presence of txistorra in Navarran gastronomy is documented from at least the beginning of the 19th century. The matatxerri itself is older by many centuries. The sausage as we know it today, the bright red, semi-fresh pork product in a thin lamb casing flavored with pimentón, is a post-Columbian creation built on a pre-Roman food tradition.
A 2014 Noticias de Navarra piece reported the matatxerri is “fading” in modern Navarra as industrial food production has replaced the domestic necessity. But the knowledge survives, preserved through events like the Txistor Eguna in Arbizu and in the practices of the fourteen IGP-certified producers who make txistorra under regulated conditions today.
What Txistorra Actually Is: The Specification
In October 2024, the European Union inscribed Chistorra de Navarra / Txistorra de Navarra / Nafarroako Txistorra in its Register of Protected Geographical Indications under Commission Implementing Regulation 2024/2793. The collective brand had been registered in September 2021, national transitional protection granted by the Spanish Ministry of Agriculture in August 2023. The full EU designation followed three years of administrative process.
The designation is administered by Reyno Gourmet, the Navarra food quality promotion body run by INTIA (Instituto Navarro de Tecnologías e Infraestructuras Agroalimentarias), a public company of the Navarra regional government. The entire Comunidad Foral de Navarra is the defined geographic zone. Production and processing must occur within Navarra.
The IGP specification defines exactly what txistorra is and what it must contain. Permitted ingredients, exclusive: lean pork, specifically panceta (belly) and papada (jowl), combined with tocino (back fat) at an approximate lean-to-fat ratio of 72% to 28%. Seasoned with salt, pimentón, and garlic. Optional: cayenne, pepper, oregano, and natural colorants including cochinilla (carmine). The casing is either natural lamb intestine (tripa de cordero) or edible collagen casing. The calibre range is 17 to 25 millimetres.
After stuffing, the sausage hangs for a minimum of two days in a secadero, a drying room that can be natural or climate-controlled. This short drying period (oreo) is the extent of the curing process. Txistorra is then sold as a semi-fresh product.
The two label colors carry different meanings. A green label indicates the oreada version: natural lamb casing, no preservatives added. This is the traditional artisanal form, with shorter shelf life and better texture. A red label indicates collagen casing with preservatives, better suited to commercial distribution. Both are certified IGP if the full specification is met.
Fourteen companies held IGP membership at the time of the EU registration: Amezkoa Embutidos, Argal, Leframa, El Bordón, Arrieta, Carnicerías Iriguibel, Hortanco Embutidos, Carnicería Javier, Galar foods, Goikoa, Embutidos Arbizu, Carnicería Arilla, Carnicería Esarte, and Carnicería Topero. Over 85% of txistorra production in Navarra comes from small artisan producers. The market in Navarra alone was approximately 1.2 million kilograms in 2023, with 1.5 million kilograms projected for 2024.
Why It Is Not Chorizo
The comparison to chorizo is understandable and wrong. Both are pork sausages. Both are red. Both are deeply embedded in Spanish food culture. Everything else diverges.
Diameter. Txistorra specification: 17-25mm. A standard Spanish chorizo is typically 40mm and often larger. When someone calls txistorra a “mini chorizo,” they are identifying only one feature, and misidentifying it as a size difference when it is actually a casing and specification difference.
Curing time. Txistorra: minimum 2 days. Chorizo: months. Two days of air-drying barely begins the biochemical transformation of the meat. Chorizo undergoes weeks of fermentation and drying that changes its protein structure, fat distribution, color, and flavor profile entirely. Txistorra is semi-fresh. It must be cooked before eating. A fully cured chorizo can be sliced and eaten directly from the wrapper. Serving uncooked txistorra is a food safety error, not a culinary preference.
Color. Txistorra’s color is bright, almost luminous red, the direct result of fresh pimentón applied to uncured meat. Chorizo’s deep brick-red is partly the same pimentón and partly the result of myoglobin oxidation during extended curing. The visual difference is unmistakable once you know what you are looking at.
Casing. Lamb intestine versus pig intestine. Thinner, more delicate, smaller calibre. The lamb casing is one reason txistorra cooks faster and the skin can pop or split if heat is too high.
Cultural identity. Txistorra belongs to Navarra. It has an EU protected designation that locks it to a specific territory and production method. Chorizo is a generic category spanning dozens of Spanish regional variants from Pamplona to Asturias to Extremadura. They are in different categories. Also not the same as longaniza, which is a generic term for elongated thin sausages with enormous regional variation across Spain.
Arbizu: The Capital
Arbizu is a municipality of under a thousand people in the Sakana valley of Navarra, roughly 30 kilometres north of Pamplona. It has given itself the title Capital de la Txistorra, and no one in Navarra argues with it.
Every second Sunday of October, Arbizu holds the Txistor Eguna, the Day of Txistorra. The market spreads across Calle Nagusia and the town plaza. Local producers set up their stalls: Embutidos Arbizu, Embutidos Juan Flores, and artisan producers including Anastasio Razkin and Laket Artesanos. A single morning in 2014 saw 140 kilograms of txistorra consumed, with pintxos and wine selling for €1.50 a round. The scale has grown since.
The centerpiece of the Txistor Eguna is the Txapela a la Mejor Chistorra, a pintxos competition in which txistorra must be the main ingredient. The prize: €300 and a txapela, the traditional Basque beret. The competition has run fifteen-plus editions. Past winners have included inventive deconstructions: a 2014 winner from Arrautseko taberna deconstructed the classic huevos con txistorra into a pintxo with txistorra, egg, potato, and pimiento.
Live demonstrations of traditional txistorra-making run throughout the morning, performed by local women following the matatxerri method. Dultzaineroak (traditional Navarran wind musicians) and trikitilaris (Basque accordion players) provide the soundtrack. The event also features a display of the Euskal txerriak, the native Basque pig breed.
Embutidos Juan Flores (Pol. Ind. Utzubar s/n, Arbizu; +34 948 460 499; chistorradenavarra.com) is one of Arbizu’s main txistorra producers and among the few that export. Their product reaches the Philippines, France, the United Kingdom, the Dominican Republic, Sweden, and Norway.
Txistorra at San Fermín
The almuerzo is the meal that structures the daytime hours of San Fermín. It happens in the window after the encierro ends, typically by 8:10am, and before midday. Long wooden tables and benches appear on the streets of the Casco Viejo. Friends and neighbors gather. This is when Pamplona operates on its own time, and what comes to those long communal tables is txistorra.
The classic form is huevos con txistorra: fried eggs cooked in the fat that txistorra releases as it fries. No added oil. The txistorra goes in first, renders its own fat, gets cooked through, and the eggs follow in the same pan. This is not a recipe that requires instruction so much as it requires the right sausage.
From there: the bocadillo de txistorra, txistorra in bread, sometimes with fried green peppers, sometimes with a rub of tomato on the bread. And the pintxo, txistorra sliced into rounds, placed on bread, held with a toothpick, arranged on bar counters throughout the Casco Viejo from early morning.
Bar Gaucho on Espoz y Mina is among the bars in the old quarter consistently noted for the quality of its pintxos, including txistorra. For a more traditional almuerzo setting, the neighborhood bars along and around Calle San Nicolás are where you will find local tables doing the full mid-morning meal during fiesta.
The other canonical form during San Fermín is talo con txistorra. Talo is a Basque corn flatbread made from txakinarto corn, a native Basque variety, stone-ground, mixed with water and salt, pressed flat, and cooked on a hot iron griddle. No leavening. No fat. The combination of talo and txistorra has a long history at Basque and Navarran festivals, with its highest-profile appearance at the Santo Tomás fair in San Sebastián every December 21. It appears in Pamplona during San Fermín too.
“Txistorra is my favourite breakfast sausage during fiesta. Full stop.” — Dennis Clancey, Founder of Encierro
How to Cook It and What to Look For
Txistorra needs heat. It is semi-fresh and must be cooked through before eating. The rules of cooking it are few.
In a pan: No oil. The sausage releases its own fat immediately on contact with heat. Medium heat. If you cook it on high, the lamb casing will rupture before the interior is cooked. Whole or sliced into rounds, both work. Whole gives you more texture contrast; sliced rounds cook faster and work better for pintxos.
On a grill: Parrilla or plancha. The skin chars slightly at contact points and the inside stays juicy. This is the preparation you will see at outdoor festival stalls.
A la sidra: Txistorra and Basque cider (sagardoa) cooked together in a pan or ceramic dish. The cider deglazes and reduces around the sausage, and the txistorra absorbs it. A classic Basque-Navarran preparation found today in modern pintxo bars as a refined version of a very old idea.
What to look for when buying: Green label means natural lamb casing, no preservatives, the traditional form. If you are in Pamplona during fiesta and see txistorra hanging in a carnicería or market stall, that is what you want. The IGP certification tells you the sausage was made in Navarra from the permitted ingredients in the regulated process. It does not tell you which producer is best. For that, go to Arbizu in October and eat through the Txistor Eguna until you form an opinion.
Frequently Asked Questions
What is txistorra?
Txistorra is a Navarran semi-fresh pork sausage seasoned with pimentón, garlic, and salt, stuffed in a natural lamb intestine of 17-25mm diameter, and air-dried for a minimum of two days. It holds EU Protected Geographical Indication status as “Chistorra de Navarra / Txistorra de Navarra / Nafarroako Txistorra,” registered October 31, 2024. It must be cooked before eating. It is not a cured sausage and cannot be eaten raw.
What is the difference between txistorra and chorizo?
They are categorically different products. Txistorra is 17-25mm in diameter in a lamb casing, air-dried for a minimum of two days, semi-fresh (must cook before eating), and bright pink-red in color. Chorizo is typically 40mm or larger in a pig casing, fully cured over weeks or months, can be eaten raw, and is deep brick-red. Txistorra belongs specifically to Navarra with an EU protected designation. Chorizo is a generic category spanning dozens of Spanish regional variants, and Navarra’s own blood sausage carries the same kind of regional splintering: what gets called morcilla de Navarra is actually three different sausages, not one.
What is txistorra in English?
There is no standard English translation. It is occasionally called “Navarran sausage” or “Basque sausage,” but neither term is specific enough to be accurate. In English-speaking contexts it is best called txistorra. In Spanish contexts the spelling is chistorra; both spellings refer to the same product. Calling it chorizo is incorrect.
Where can you eat txistorra in Pamplona during San Fermín?
The almuerzo tables in the streets of the Casco Viejo are where txistorra is most often eaten during fiesta, typically as huevos con txistorra or in a bocadillo. Bar Gaucho on Espoz y Mina is cited in Pamplona dining sources for pintxos including txistorra. The pintxos bars between Plaza del Castillo and Estafeta carry it during fiesta in various forms. For the most direct version, find a bar that is pan-frying whole links and serving them with bread.
Dennis Clancey is the Founder of Encierro and has attended San Fermín every year since 2007. Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.