Green Chartreuse, a spicy French liqueur tinted by the 100-plus plants that flavor it, gives this cocktail a lovely pale lime color. Slideshow: Beautiful Champagne Cocktails
In a small dish or glass, soak the sugar cube with the Chartreuse. Pour the Licor 43 into a chilled flute, then add the Champagne. Drop in the Chartreuse-soaked sugar cube and garnish with the lime twist.