<Tr> <Th> Preparation </Th> <Td> Ensure both ingredients are well chilled, then mix into the glass . Serve cold . </Td> </Tr> <Tr> <Td_colspan="2"> Mimosa recipe at International Bartenders Association </Td> </Tr> <P> A mimosa cocktail is composed of one part champagne (or other sparkling wine) and one part chilled citrus juice, usually orange juice unless otherwise specified . It is traditionally served in a tall champagne flute at brunch, at weddings, by the pint, or as part of first class service on some passenger railways and airlines . </P> <P> It is believed to have been invented at the Hôtel Ritz Paris by Frank Meier, in about 1925 . It is probably named after the common name in Europe for the yellow flowers of Acacia dealbata . </P>

What is it called when you mix orange juice and champagne