Ombre Citrus Mocktail

The key to the ombre effect in this pretty mocktail is grenadine; it sinks to the bottom of the glass, down into the pink grapefruit juice, where it adds a ruby hue to the bottom that gives way to the pink colour on top. The recipe makes one drink, but it can easily be scaled up for more servings. Garnish with a small piece of a grapefruit slice, if desired.