In a large punch bowl, combine the lemon-lime soda, frozen limeade concentrate, and pineapple juice. Stir thoroughly to mix the flavors.
Add the Green:
To achieve the signature Grinch green, add a few drops of green food coloring. Stir until the color is evenly distributed. (Skip this step if your limeade concentrate and sherbet already provide the desired shade.)
Add Sherbet:
Using an ice cream scoop, add generous scoops of lime sherbet to the punch bowl. Let the sherbet partially melt, creating a creamy, frothy layer on top.
Garnish:
Drop a few maraschino cherries into the punch for a festive pop of red against the green.
Serve and Enjoy:
Ladle the punch into glasses or festive cups. Serve immediately while cold and frothy!
