1Set blood orange on a cutting board and, using a sharp knife, cut off and discard ends. Slice rind and white pith off fruit using a gentle downward sawing motion, cutting away as little flesh as possible. Discard rind.
2Slice fruit into 1/2-inch pieces. Divide pieces evenly among the wineglasses.
3Sprinkle 1/2 teaspoon sugar atop orange slices in each glass and muddle together to extract juice. Add 1/2 teaspoon vermouth to each glass and stir.
4Divide sparkling wine among the glasses, stir, and serve.
Originally created for the W Hotel in New York, the Bond St. Sparkler is the epitome of a seasonal twist on a classic champagne cocktail such as the Bellini. Add a bit of flair to your next brunch and pour a sparkler inspired by the seasonal fruits available to you. It is sure to please.