1 sugar cube soaked in good quality balsamic vinegar, such as Acetum Santorini Balsamic Vinegar of Modena
1/2 ounce rum
Champagne
orange peel (garnish)
Diamonds are Forever
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Method:
Soak the sugar cube in the vinegar and place at the bottom of a champagne flute. Add the rum and slowly top with Champagne. Garnish with a twist of orange peel.