Add 45ml sloe gin and 30ml sweet vermouth to a mixing glass.
Fill with ice and stir for 20–25 seconds until well chilled and properly diluted.
Strain into a chilled cocktail glass.
Express a lemon peel twist over the surface to release the oils, run it around the rim, and place it on the glass to garnish.
Sloe gin varies widely in sweetness and intensity by brand - Plymouth Sloe Gin offers a drier, more authentic blackthorn berry character that pairs beautifully with a lighter sweet vermouth like Dolin Rouge. If your sloe gin is particularly sweet, consider a split of sweet and dry vermouth to add balance.
My Bar Shelf reads your shelf and shows you every cocktail you can make from what you already own, including Blackthorn.