Pour in Midori and rum, then give it a light stir. If you prefer a sweeter drink, you can use whichever size glass preferred and add more soda.
Top with as much lemon-lime soda as desired.
Notes
Shaken/Stirred: While we mix this directly in the glass, you can lightly shake in a cocktail shaker with ice for a crisp, well-blended texture. Be sure to add the bubbles after you serve it.
Glass: Serve in a martini glass, coupe glass, lowball or a fun holiday-themed tumbler for extra festive flair.
Garnishes: Add a maraschino cherry to mimic the Grinch’s heart or rim the glass with red sanding sugar for a pop of color.
Try Silicone Trays: Use fun holiday-shaped ice cubes to dress things up.
Make it in Batches: Multiply the quantities for a punch bowl or pitcher for easy serving; just hold off on the bubbles until individual pours have been served.
Festive Touch: Dip the rim in simple syrup and then red sanding sugar prior to mixing your drink.