Blue Elder Sour Cocktail Recipe | Master Bartender

Ingredients

• 25 ml Bols Blue Curaçao
• 25 ml St-Germain elderflower liqueur
• 20 ml Lime juice (freshly squeezed)
• 30 ml Egg white
• 40 ml Tanqueray London Dry Gin
• 1.25 ml Sugar syrup 'rich' (2 sugar to 1 water, 65.0°Brix)