Prepare Your Glass: Take a tall glass (a Collins or highball glass works beautifully) and fill it three-quarters full with ice cubes. A chilled glass is even better.

Add the Base: Pour the 180ml of chilled ginger ale over the ice, leaving a little space at the top.

Add the Lime: Next, pour in the 15ml of freshly squeezed lime juice. Give it a very gentle stir, just one or two turns with a long spoon, to combine it with the ginger ale.

Create the "Sunrise" Effect: This is the key step for that classic look. Slowly and gently pour the 20ml of grenadine into the glass. I find that pouring it over the back of a spoon held just above the surface of the drink helps it sink to the bottom without mixing too much. This creates a beautiful layered look, with a deep red at the base fading up to the pale gold of the ginger ale.

Garnish Generously: Drop two or three maraschino cherries into the drink. They will nestle in the grenadine at the bottom.

Final Touches: Place a thin wheel of lime on the rim of the glass or add a twist of lime peel directly into the drink for an extra burst of aromatic citrus oil. Serve immediately with a straw or a long cocktail stirrer.