Add tequila and orange juice to an ice-filled highball glass.
Slowly pour in the grenadine. It will sink to the bottom.
Garnish with a maraschino cherry and a slice of orange.
Notes
Add the grenadine last. It will sink to the bottom rather than mix with the OJ. Pouring the orange juice on top of the grenadine will create a solid pink drink rather than a layered, sunset-like effect.Don’t stir the drink (unless you want to). It will lose the ombré effect.