A gorgeous cocktail to toast with on Halloween or St Patrick's Day – Guinness, bourbon, blackberries and lime. Double or triple the recipe in order to use the whole can of Guinness draught.
Add the blackberries, bourbon, grenadine and lime juice into a cocktail shaker. Muddle the blackberries with a mudding spoon or the back of a rolling pin.
Half fill the shaker with ice and shake hard for 30 seconds.
Pour into a rocks glass filled with ice. Stir in the Guinness and garnish with a lime wedge and a couple of blackberries threaded on a toothpick.