Schramsberg spent years mastering the art of the multi-vintage sparkler, then released the results under a different name. That's Mirabelle, launched in 1992 and still made in the same cellars by the same team behind the flagship wines. The blend draws Pinot Noir and Chardonnay from cool corners of the North Coast - Carneros, the Sonoma Coast, Anderson Valley, Marin - with base wines aged in both barrel and tank before the assemblage, then roughly two years on the lees in bottle after the second fermentation. That's traditional method done the long way, and it shows in the toasty depth behind the fruit. A serious bottle of California bubbles that doesn't ask for a special occasion.