Add your raspberries and strawberries to a cocktail shaker, and muddle with the sugar and lime
Pour in the elderflower cordial, grappa and orange juice
Shake well, until the outside of the shaker is icy to the touch
Pour, without straining, into a tumbler glass
Garnish with fresh blueberries and banana - slice the banana thinly and add half a bluebbery in the middle to make it look like a spooky eyeball in your drink. Don't worry if it sinks to the bottom of the glass, finding an eyeball in your drink is part of the fun!