César Márquez operates in Bierzo, the mountainous subregion of Castilla y León known for mineral-driven wines and cool-climate intensity. The winery focuses on indigenous varieties suited to the region's slate soils and Atlantic influence. El Val, a Godello, represents the white expression—a variety prized in Bierzo for its structure and salinity. Sufreiral blends Garnacha Tintorera and Mencia, the latter a dark-skinned grape central to the region's identity, delivering the earthy complexity and tannin grip Bierzo is recognized for. Pico Ferreira, a Mencia-based wine, further demonstrates the winery's commitment to the varietal. Wine Advocate and Decanter have rated these wines, with El Val achieving particular distinction among prestige critics.