This refreshing cocktail is a twist on the classic Pisco Sour with the addition of St Germain Elderflower Liqueur. Here's the recipe:

Ingredients:
- 2 oz Pisco
- 1 oz St Germain Elderflower Liqueur
- 1 oz Freshly squeezed lime juice
- 1/2 oz Simple syrup
- 1 Egg white
- Angostura bitters (for garnish)

Instructions:
1. In a shaker, add the Pisco, St Germain, lime juice, simple syrup, and egg white.
2. Dry shake (without ice) for 10-15 seconds.
3. Add ice to the shaker and shake vigorously for an additional 10-15 seconds.
4. Strain the cocktail into a chilled glass.
5. Garnish with a few dashes of Angostura bitters on top.

Enjoy the floral and citrusy flavors of this St Germain Pisco Sour!