Description:
The Twilight Empress Sour is a mesmerizing blend of the distinctive butterfly pea flower-infused Empress Gin, which offers a magical color-changing experience, paired with the rich, velvety texture of egg whites. This cocktail brings a touch of elegance and intrigue to any evening affair, with its smooth botanical notes and a hint of citrus to brighten the ensemble.

Ingredients:
- 2 oz Empress 1908 Gin (Infused with butterfly pea flower for natural color)
- 3/4 oz Fresh lemon juice
- 1/2 oz Simple syrup
- 1/2 oz St-Germain elderflower liqueur
- 1 Egg white
- Ice cubes
- Garnish: Lemon twist and a sprinkle of edible violet petals

Instructions:
1. In a shaker, combine Empress 1908 Gin, fresh lemon juice, simple syrup, St-Germain, and one egg white.
2. Dry shake (without ice) vigorously for about 15 seconds to emulsify the egg white.
3. Add ice to the shaker and shake again until well-chilled.
4. Double-strain the mixture into a chilled coupe glass to ensure a smooth, froth-topped drink.
5. Carefully garnish with a lemon twist and edible violet petals to echo the gin's floral notes and enhance the visual appeal.

Glass:
Serve in a classic coupe glass to showcase the beautiful color and to maintain the frothy egg white layer on top of the cocktail.