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Add a tablespoon of orange liqueur (Cointreau) into a champagne glass. You can leave this out for a milder version of a Mimosa cocktail.
Fill the glass halfway with champagne and fill up the rest with orange juice. If you add in the orange juice before the champagne the glass will be much dirtier.
Stir the cocktail (this step is optional) using a long spoon and garnish with a slice of orange. Enjoy your cocktail!