To rim the glasses: Pour a thin layer of red sanding sugar onto a plate or shallow bowl. Do the same with the corn syrup. Dip the rim of a glass into the corn syrup, being sure to coat the entire rim. Then, dip the rim into the red sanding sugar. Repeat with both glasses.
Place a scoop of lime sherbert in each glass.
Add Hawaiian Punch, Sprite, and green food coloring (if using). Stir gently to disperse food coloring evenly throughout.
Notes
For a large batch:
1 (48 ounce) lime sherbet
1 gallon Hawaiian Punch
1 (2 liter) Sprite
Spoon sherbet into a pitcher or punch bowl.
Pour the Hawaiian punch and Sprite over the sherbet. Add food coloring and stir.
Serve with rimmed glasses and enjoy.
*Depending on the size of your punch bowl or pitcher you might need to halve the recipe.