Step 1.
- Chill a champagne flute by filling it with ice water for a few minutes.
Step 2.
- In a separate glass, soak a sugar cube in Angostura bitters until fully saturated.
Step 3.
- Remove the ice water from the flute and place the bitters-soaked sugar cube at the bottom.
Step 4.
- Slowly pour in chilled champagne, allowing it to flow gently over the sugar cube.
Step 5.
- Garnish with a twist of lemon peel by twisting it over the drink's surface to release oils.