Put a glass in the refrigerator because cocktails taste best when chilled.
Take out you cocktail shaker. Put in some crushed ice first. Pour in the grapefruit juice, orange liqueur and rosewater in the required amount. There is no order to be followed, just make sure to get an even blend.
Shake hard with both hands for half a minute with the lid tightly sealed to avoid any spills.
Strain the mixture into the cocktail glass taken out of the refrigerator.
Top it with champagne which will create a sizzling effect that will leave no room for garnishing.
Let us celebrate for great successes in human history so that drinks as good as this are invented by barmen as creative as Joe. Cheers!!