The pepper on the bar at every pintxos stop in Pamplona says the same thing on the menu: pimientos de Padrón. It arrives blistered from hot olive oil, wearing coarse salt, and it costs the same two euros everywhere in the city. The bar’s supplier is almost certainly not in Padrón. According to the Consello Regulador of the protected designation, approximately 90% of the pimientos de Padrón sold across Spain originate outside Galicia, primarily from Almería, Murcia, and Morocco. The real thing comes from a single river valley, is sold under a different name, and is available for roughly five months a year.
The distinction matters for anyone eating in Pamplona. The authentic pepper, grown in the Sar and Ulla river valleys of Galicia under the PDO designation Pemento de Herbón, is smaller, thinner-walled, and more variable in heat than the commercial version. A private company registered the name “Pimiento de Padrón” as a commercial variety name in 1985, before Galician farmers organized to protect their product. The farmers who cultivate the original pepper had to use the name of the parish where it was first grown: Herbón. Most bar menus across Spain still say Padrón. The label is wrong. The pepper under it is often good. The original is better. It is not the only case in Spanish food where a regional name on a menu promises more legal weight than it actually carries: the same gap shows up with anchoas del Cantábrico, a product with no protected designation behind it at all.
The research for this article draws on EU Commission Regulation No 700/2010 granting the PDO, the official pliego de condiciones filed with Spain’s Ministry of Agriculture, peer-reviewed studies on capsaicin variability in Capsicum annuum published in the Journal of Agricultural and Food Chemistry and IntechOpen, and primary documentation from the Consello Regulador de la DOP Pemento de Herbón.
From Tabasco to a Galician Convent
The pepper arrived in Galicia from the Americas in the seventeenth century. The vehicle was the Franciscan missionary system. The Convento de San Antonio de Herbón, a Franciscan house founded in 1396 in the parish of Herbón within the municipality of Padrón, was elevated in 1701 to a Colegio de Misioneros de Propaganda Fide: a formal missionary college that trained friars to go to the Americas and received them when they returned. Seeds traveled back with the returning missionaries.
The region of origin cited by the official PDO documentation and by the Padrón municipal government is Tabasco, Mexico. No individual missionary is named in any historical record. The transfer is institutional. What is documented is the result: Franciscan monks planting Capsicum annuum seeds in the convent garden and, through generations of selecting for sweetness, small size, and early harvest, developing the Padrón landrace from that American starting point.
The first documented commercial activity appears in the Catastro de la Ensenada, a royal cadastral survey conducted around 1752 to 1754 and held in the Archivo General de Simancas. It records dried and ground pepper being sold commercially in Herbón, roughly two hundred years after the monks began cultivating the seeds. The variety stayed geographically concentrated in the Sar and Ulla river valleys because seeds were transmitted locally, including as paraphernal goods in marriage dowries. Commercial-scale fresh production became possible only in the mid-twentieth century, when paved roads and refrigeration could move perishable peppers beyond Galicia for the first time. The Festa do Pemento de Herbón, now held on the first Saturday of August each year in the carballeira of the convent, was inaugurated in 1979 and is declared of provincial tourist interest.
Pemento de Herbón: The Name the Authentic Pepper Had to Use
The protected designation name for the authentic Padrón pepper is not “Pimiento de Padrón.” It is Pemento de Herbón — Galician for “pepper of Herbón.” The EU Commission granted the PDO under Regulation No 700/2010, effective August 5, 2010. The Consello Regulador, headquartered in Padrón, oversees approximately 26 to 30 registered producers in the certified zone.
The reason for the name is not academic preference. In 1985, a private company registered “Pimiento de Padrón” as a commercial plant variety name, before Galician farmers organized to pursue EU-level protection. When producers in Herbón later applied for a PDO, the name of their own product was already taken. They used the name of the parish where the Franciscan convent stands: Herbón. A 2023 paper in the academic journal Sociologia Ruralis documents this as appropriation by a private commercial actor of a name that belonged to the farmers who created the product.
The PDO production zone covers five municipalities: Padrón, Dodro, and Rois in the province of A Coruña, and Pontecesures and Valga in the province of Pontevedra. Within this zone, the pliego de condiciones specifies: fruit length 3.5 to 5.5 centimeters, diameter 1.5 to 2 centimeters, thin walls, bright glossy green at harvest. Packaging must happen within 24 hours of harvest, at origin. Seed must come from locally propagated stock — commercial Padrón-variety seed from outside suppliers is explicitly prohibited. The certified DOP pepper runs to a stigmasterol content averaging 1.3%, versus approximately 5.2% for commercially grown peppers from Almería: a biochemical marker that makes laboratory verification of origin possible with reported 100% reliability.
The three most significant certified producers are SAT A Pementeira (lospimientosdepadron.com), the largest cooperative with eight hectares of certified land; Pimerbón, the oldest cooperative; and Pementos Carmucha (pimientosherbon.com), a family operation of more than a century that supplies Martín Berasategui, the most Michelin-starred chef in Spain.
Why Some Burn and Others Do Not
In Galician: Os pementos de Padrón, uns pican e outros non. In Spanish: Los pimientos de Padrón, unos pican y otros no. The English is flat by comparison: “Padrón peppers — some are hot and some are not.” The saying captures something real: under identical growing conditions, two peppers from the same plant can diverge significantly in heat.
The variance is not random. It is the result of four interacting factors. The Padrón is a landrace, not a selectively stabilized commercial cultivar, which means the population carries genuine genetic variation at the capsaicin-production genes (primarily Pun1 and pAMT). That genetic heterogeneity is the necessary precondition. On top of it, water stress matters: when a plant experiences drought during fruit development, enzyme activity in the placenta shifts. Phenylalanine ammonia-lyase, cinnamic acid-4-hydroxylase, and capsaicinoid synthetase all upregulate; peroxidase, which degrades capsaicin, is suppressed. The net result is more capsaicin synthesized and less destroyed. High ambient temperature and UV exposure have a similar upregulating effect. And within any single harvest, larger, older fruits accumulate more capsaicin than smaller, younger ones.
The practical implication is seasonal. June peppers, harvested young in a cool wet Galician spring, are predominantly mild: roughly one in ten generates noticeable heat. By late August, with cumulative drying and heat, the proportion of hot fruits rises, though no peer-reviewed study has confirmed it crosses fifty percent. The pepper’s total Scoville range runs from approximately 500 to 2,500 SHU: a mild Padrón sits at the low end, a hot one at the high. For reference, a jalapeño starts where the hottest Padrón ends.
Crucially, the blister on a properly made pimiento has no predictive relationship to heat. You cannot see, smell, or identify which one will catch you. That is the point.
How to Eat Them
Hot olive oil in a wide pan, brought to shimmering. Pimientos de Padrón go in whole, stems on, in a single layer. Five to seven minutes, turning occasionally, until the skins wrinkle and blister and turn golden-brown in patches while the flesh softens. Out of the oil immediately, and then: coarse salt — sal gorda or fleur de sel — applied directly to the hot peppers while they are still piping. Never before. Pre-salting draws moisture, collapses the skin, and kills the blister that defines the dish.
They come on a small plate or clay cazuela, stems intact. You pick them up by the stem and eat them in one or two bites. They are not a starter in a seated meal. They are a tapa or pintxo — eaten standing at the bar counter, in the space between one drink and the next. In Pamplona they fit exactly into the txikiteo: the moving bar crawl that structures drinking in the Casco Viejo. One bar, one drink, one pintxo. The canonical pairing is cold beer, a glass of txakoli, or Albaríño. The peppers are too brief and too direct to need anything more.
Pimientos de Padrón at San Fermín in Pamplona
Pimientos de Padrón reach Pamplona’s bars in full form during San Fermín week, July 6 to 14, because July falls inside the five-month harvest window. This is coincidence of calendar, not ritual. There is no ceremonial link between the pepper and the festival. They are simply at their best in summer, and San Fermín is a summer festival.
The prime Pamplona territory for pintxos runs south and east of Plaza del Castillo: Calle San Nicolás with approximately twenty bars in two hundred metres, Calle Jarauta, Calle San Gregorio, and Calle Estafeta. Pimientos de Padrón appear at most bars in this zone. The almuerzo — the outdoor mid-morning meal eaten in the streets after the encierro — gives way to pintxos by late morning, and fried peppers move through that transition naturally.
Dennis Clancey, who has attended San Fermín every year since 2007, names Cervecería La Mejillonera as his fast meal of choice during fiesta week. The bar sits at Calle Navarrеría 12, confirmed in the Pamplona city government’s official business directory, on the street that runs along the edge of Plaza de la Navarrеría in the Casco Viejo. It is a narrow standing bar with ceramic tiles and stainless steel; customers take their mussels and peppers out to the plaza directly opposite. The menu is built on Galician mussels from the Rías Baixas D.O., pimientos de Padrón, calamares, and patatas bravas.
“La Mejillonera on Navarrеría is the best fast meal in Pamplona during fiesta.” — Dennis Clancey, Founder of Encierro
The structure is exactly what Pamplona’s pace demands during fiesta week. Order at the bar, eat standing in the plaza, back out in the street in ten minutes. Encierro’s Pamplona tours and fiesta preparation covers how the day fits together from the early morning encierro through to the late-night asador dinner.
Frequently Asked Questions
What are pimientos de Padrón?
Pimientos de Padrón are a small Galician pepper variety originating from seeds brought by Franciscan monks from Tabasco, Mexico in the seventeenth century, cultivated for centuries in the Sar and Ulla river valleys near the town of Padrón in A Coruña, Galicia. They are flash-fried in hot olive oil and served with coarse salt. The authentic version is protected under the EU PDO designation Pemento de Herbón, granted in 2010. Most peppers sold as “pimientos de Padrón” across Spain originate outside Galicia and do not carry the PDO certification.
Why do some pimientos de Padrón burn and others do not?
The heat variance results from genetic heterogeneity in the landrace population combined with environmental stress during fruit development. Water deficit and high temperatures trigger increased capsaicin synthesis in the fruit’s placenta. Larger, older fruits accumulate more capsaicin than young ones. In practice: June peppers are predominantly mild (roughly 1 in 10 is hot); late-summer peppers carry a higher proportion of heat. The total Scoville range is 500 to 2,500 SHU — a hot Padrón is at or below the floor of a jalapeño. The blister on a properly cooked pepper gives no indication of which way it will go.
Are pimientos de Padrón Galician or Basque?
Galician. The pepper originates at the Convento de San Antonio de Herbón in Padrón, A Coruña, Galicia. It has no Basque origin or Basque name. It appears widely in Basque Country and Navarra bars as a tapa and pintxo because it works well as a fried bar snack, but the plant, the protected PDO designation, and the authentic cultivation zone are entirely in Galicia. The PDO covers five municipalities in the provinces of A Coruña and Pontevedra.
Where can I eat pimientos de Padrón in Pamplona during San Fermín?
They appear at most pintxos bars in Pamplona’s Casco Viejo during San Fermín, particularly on Calle San Nicolás, Calle Jarauta, and Calle Estafeta. Cervecería La Mejillonera at Calle Navarrеría 12 is a specific well-established option: a standing bar known for Galician mussels and pimientos de Padrón directly on the edge of Plaza de la Navarrеría in the old quarter. It is an efficient stop during fiesta week when time between events is limited.
Every article on the Encierro blog is authored or reviewed by active bull runners with direct experience in Pamplona.