Aperol Sour

Name: Aperol Sour
Ingredients: 1 fresh Egg white; 1⁄2 oz Tanqueray London Dry Gin; 5⁄6 oz Aperol Aperitivo; 1⁄2 slice Orange; 5⁄6 oz Bombay Sapphire Gin; 1⁄2 oz Sugar syrup 'simple'; 2⁄3 oz Orange syrup; 2⁄3 oz Lemon juice; 1 oz Beefeater London Dry Gin; 2 dash Orange Bitters by Angostura