Silver Sloe Gin Fizz

1 oz. Plymouth or Hayman’s Sloe Gin
½  oz. Plymouth Gin
1 oz. Fresh Lemon Juice
½ oz. Simple Syrup (2-1) or more to taste
White of 1 Egg

Combine all ingredients in a cocktail shaker without ice. Shake to begin the emulsification of the egg white and add ice. Shake hard until cocktail is extremely cold and strain into a chilled fizz glass. Top with soda water until the egg white foam stands over the rim of the glass. Serve with a straw.