Muriel produces wines from Rioja, Spain's most celebrated red wine region. The winery works primarily with Tempranillo, the dark-skinned grape that defines Rioja's structure and aging potential, alongside Viura for its white expressions. The Rioja Blanco, made from Viura, displays the crisp, mineral character typical of the region's whites. Among reds, the Reserva La Casa Grande Catedra del Vino and Viñas Viejas Gran Reserva represent the winery's commitment to extended oak aging and complexity—hallmarks of Rioja's traditional approach. These wines have been assessed by major critics including Decanter, Wine Spectator, Wine Enthusiast, and Wine Advocate, reflecting their standing within the region's quality hierarchy.