1 1/2 oz of Gin
1/2 oz of Blackberry Brandy
1/2 oz of Lemon Juice
1/2 oz of sugar syrup (or simple syrup)
1/2 oz of egg
4 oz of soda water
Shake ingredients (except soda) well and strain into a highball glass half-filled with ice. Add the soda, and garnish with a slice of lemon and a cherry. Serve with straws and a muddler.