Pour margarita mix, lime juice, and zest into a small pitcher. Blend together and pour into an ice-cube tray.
Gently drop a few drops of grenadine syrup into each compartment, then swirl with a toothpick. Freeze until solid.
Once frozen, add ice cubes to Champagne flutes or wide-rimmed glasses, depending on the size of the ice cubes.
Gently pour orange juice and sparkling white wine (or Central Market Prosecco Soda for a nonalcohol version) over margarita ice cubes.
Garnish each glass with a thin slice of lime and serve.