Blackberry Gin Sour is savoureux average cocktail at 1 standard drinks. Shaken with 30ml blackberry liqueur vedrenne and 15ml gin with 20ml lemon juice as well as 15ml egg white including 10ml blackberry syrup torani also 100ml ice and best served with farinaceous starchy dishes. Just add all ingredients to shaker then quick dry shake without ice and add ice to shaker. Shake very well until foamy and strain into glass and garnish by adding blackberries and served in a saucer glass cold.