Bohemian Cooler

Invented by Tom Schlesinger-Guidelli
1 oz St Germain
2 oz Sazerac Rye Whiskey
2 dashes Angostura Bitters
1 oz Lemon Juice
2 oz Barritt's Original Ginger Beer

Shake all ingredients except Barritt's and strain into ice-filled glass. Add Barritt's. Garnish with lemon wheel.