Núria Claverol is a premium cava line from the Sumarroca family of the Penedès in Catalonia, named in tribute to the family matriarch. The Allier Blanc de Blancs is built on Chardonnay grown on the family's own estate vineyards, farmed organically on the limestone-rich, well-drained soils of the Penedès at altitude inland from the Mediterranean. The region's warm days and cool nights help retain acidity in Chardonnay destined for long-aged sparkling. The 2016 growing season in the Penedès was generally favourable, yielding ripe but balanced fruit suited to Gran Reserva ageing. Careful vineyard selection and low-intervention, sustainable farming underpin the estate's aim of terroir-driven, single-variety cava.

Chardonnay is hand-selected and gently pressed, with the base wine fermented to preserve varietal purity before undergoing a second fermentation in bottle in the traditional method. As a Gran Reserva cava, the wine is aged on its lees for a minimum of thirty months, and typically considerably longer, developing fine bubbles and toasty, brioche complexity over its Blanc de Blancs core of white-orchard and citrus fruit. Following extended lees maturation it is riddled, disgorged and finished to a brut level. The style is precise and structured, with Chardonnay's linearity carried by a creamy, persistent mousse. Exact lees duration and dosage for this release were not individually confirmed.