Start off by taking a single sugar cube, and while holding it over the opening of a bottle of Angostura bitters, invert the bottle so that some bitters soaks directly into the sugar. Drop the cube into the bottom of a chilled Champagne flute, and then fill the glass with Champagne. Garnish with a lemon twist, if desired. Repeat process 3 more times to make 4 drinks.
Recipe courtesy of Bobby Flay