Pour in the chilled grenadine syrup, orange juice, and lemon-lime soda.
Add the maraschino cherries and gently stir to combine.
Serve immediately while cold and bubbly. Garnish with additional orange slices and cherries, if desired.
Notes
For the best carbonation, add the lemon-lime soda just before serving.Store leftover punch covered in the refrigerator for up to 3 days. Keep in mind that the soda will lose some of its carbonation during storage.