To the bottom of a champagne flute, add sugar cube. Sprinkle sugar cube with 5 dashes Angostura bitters.
Top with dry sparkling wine and garnish with a starfruit slice.
Angostura bitters: This classic cocktail ingredient can be found at many liquor stores, wine shops, large supermarkets, and online.
Dry sparkling wine: Yes, even though this is called a "Champagne Cocktail," it can be made with nearly any sparkling wine that errs on the "brut" (dry) side of the sweetness spectrum. See "Recipe FAQs" below for more about the different varieties of sparkling wine.
Starfruit: A lemon twist is the traditional garnish on a Champagne Cocktail, but I love how unique a festive a slice of fresh starfruit looks. Or, substitute an orange twist.
Yield: This recipe makes 1 cocktail. Each full bottle of sparkling wine should yield about 5 cocktails.