manufacturer of interior automotive components. It is also the headquarters for south Europe Benteler International. Tertiary sector It employs the bigger percentage in the city and is represented by the public sector (production, delivery and allocation of goods and services), due to the capital status. Culture The city has a complete culture infrastructure, remarked by the Auditorio y Palacio de Congresos de Burgos, which opened in mid-2012. Language Spanish, also called Castilian, originated in Castile and spread throughout the Crown of Castile's possessions following the reconquista. It was eventually dispersed throughout the Spanish empire following the conquest and colonization of the Americas, and Spain after the union of the Catholic Monarchs's kingdoms being co-spoken with other languages. Of the many different variations and dialects found throughout the world, it's argued that the purest Spanish can be found in the region of Burgos due to the fact that the language first developed here in the 10th century. The Spanish language can be traced back to the monastery of Valpuesta located north-east of the city of Burgos. The Valpuesta cartularies are significant in the history of the Spanish language, and their status as manuscripts containing the earliest words written in Spanish has been officially recognised. The first utterings of Spanish continued in the "Silos Glosses", recorded in the Burgos monastery of Santo Domingo de Silos. Cuisine Burgos province is famous in gastronomy for: Queso de Burgos, a white cheese which is soft and unctuous (because it is made with whey). Although originally made with sheep's milk, now cow's milk or mixtures are more common. Each comarca (rural district) produces a minor variation, and the major dairies produce an industrial product that is acceptable for people with sensitive digestion. Burgos is blessed with a moderate climate and this fresh cheese was able to be conserved there without the need for curing of more than 10 days. With the improvement of aseptic industrial production processes this can be extended to about 30 days at a cool 6 °C. Its production reaches 35,000 tons annually. Morcilla de Burgos, a pig's-blood sausage (black pudding), is a staple country food known across the Iberian peninsula. Spiced with onions and herbs its most noticeable content is rice (often mistaken for fat) which makes it one of the lightest and healthiest products of its kind. Oral tradition says that it must be "salty, smooth and piquant" (see Spanish pages