Fill Ox & Studs Dry Gin, lemon juice and sugar syrup together with ice cubes in the shaker, close tightly and shake. Put blackberries in the cocktail glass and crush them with a pestle. Then fill three quarters of the cocktail glass with ice cubes. Pour the contents of the shaker through a bar sieve and stir once. Then decorate the drink with 2-3 fresh blackberries.