Opus One 2019 is the flagship Napa Valley red blend from the Mondavi-Rothschild partnership, here in a 1.5-liter magnum. The 2019 vintage leads with Cabernet Sauvignon at 78%, filled out by Merlot, Cabernet Franc, Petit Verdot, and a splash of Malbec, all grown on the estate’s Oakville vineyards. It pours dark and layered: cassis and black cherry over violet, graphite, and fine cedar, carried by the polished tannins that let it age for decades. The magnum format slows that aging further, making this the bottle to cellar for an anniversary or open across a long table. Decant it a good hour before pouring, and reach for stemware with room to breathe.