Fill a cocktail shaker halfway with ice cubes.
Add the dark rum, Kahlúa, and light cream.
Shake vigorously for 10–12 seconds until well chilled and combined.
Strain into a chilled cocktail glass.
Garnish with a light dusting of freshly grated nutmeg and serve immediately.
Shaking cream cocktails vigorously is essential - it aerates the cream slightly and fully integrates the fat with the spirits, producing a silkier, more cohesive texture than stirring. Freshly grated nutmeg releases volatile aromatics that pre-ground nutmeg cannot match, so grate it directly over the glass just before serving.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Quentin.