Top slowly with the ginger beer, leaving about half an inch of room at the top.
Pour the grenadine very slowly down the inside wall of the glass, so it sinks to the bottom in a visible layer.
Do not stir, so the color gradient stays intact.
Garnish with a cherry dropped in and an orange twist perched on the rim.
Good to Know
Real pomegranate grenadine (check the label for pomegranate juice rather than corn syrup and red dye) is the single swap that makes this taste like a bar order rather than a kid's drink.