Place a handful of raspberries in a cocktail shaker, and using the back of a spoon (or a muddler) squash the raspberries. Now add 25ml sweet vermouth, 25ml dry vermouth, 75ml Plymouth gin and fill with ice. Shake well, and double-strain into two chilled martini glasses.

Optional: for a slightly sweeter version add a spoonful of pomegranate molasses.