Pour the orange juice into a champagne glass and Ill with the Champagne.
This drink was also known as a Bucks Fizz. Frank Meier of the Ritz Bar in Paris had an alternate recipe called the Valencia, with orange juice, apricot liqueur, and Champagne. (Valencia is also a Martini variation, with fino sherry in place of the vermouth.) A float of Cointreau is an appealing extra for a special drink.