Per serving
Serve this cocktail in a flute so the sugar cube sinks to the bottom – it will push the bubbles upward. Prosecco, kirsch and coffee also work.
Place the sugar cube on a small plate, then drizzle with bitters, rotating several times until it is fully coated.
Drop the cube into a champagne flute, then add the cognac. Slowly pour in the champagne.
Twist the orange zest over the glass to release the oils, then discard it or wrap it around the stem of the glass.
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