The galaxy is filled with wonderful things, not least the news that its centre tastes of raspberries and smells of rum. This is great news because both raspberries and rum are themselves wonderful things and because the centre of the galaxy is not actually made of raspberries and rum - rather it contains ethyl formate, a molecule that exhibits both traits. They're good traits to incorporate into a cocktail, too.
15ml handcrushed raspberry juice
10ml sugar syrup
1 dash Angostura Bitters
60ml Havana Club Especial
Place the raspberry juice, syrup and bitters in the base of a mixing glass. Add ice and stir. Add the rum gradually while stirring. Garnish with a couple of raspberries.
To make the handcrushed raspberry juice, simply use a barspoon or muddler to force some fresh raspberries through a fine-strainer. You'll need about 10 or so to yield 15ml. Commercially available raspberry purée works as a substitute.
There's a point to made, I think, about stirring drinks. The handcrushed raspberry juice is opaque so you lose the clarity that you associate with stirred drinks, but the idea behind stirring this drink is to give it the smooth texture you always get.