Garnish:
Add juice and rum to champagne glass, top with champagne. Pour a bit of grenadine or cherry juice on top and garnish with pineapple wedge and a cherry!
The amount of each ingredient is just a guide, use more or less juice as desired. You could also use an orange/pineapple juice if you want.
Find it online: https://www.imbored-letsgo.com/malibu-mimosas/