Inspired by the classic Champagne cocktail, we wanted to dress up a glass of sparkling wine without masking the flavor. We kept the bitters, but rather than sprinkle them on a sugar cube—which usually is dropped to the bottom of the glass—we combine them with a bit of tart pomegranate juice, creating a beautiful layered cocktail with a gentle fruitiness. We call for filling each flute glass about two-thirds full with sparkling wine, or about 4 ounces for a standard flute.