Bold, unconventional, and multi-faceted in flavor, this grapefruit mimosa is like the Katharine Hepburn of the brunch cocktail world. The flavor is a bit sweet and a bit tart, slightly astringent, and punctuated with a gutsy dimension of rosemary. In other words, this variation is an excellent alternative to the straightforward classic version. You can certainly leave out the rosemary if you prefer...but it contributes a delightful woodsy depth, so I highly recommend it!