A Bourbon and St Germain cocktail for Halloween
Fill a tall glass with ice (I used my St Germain Spritz glass, but a Collins glass is what was originally specified)
Pour in the Bourbon, followed by St Germain, followed by the lemon juice and stir
Top with ginger beer and stir gently again
Finish with the Angostura bitters, allowing the bitters to float on top and gently mix through the rest of the drink giving a 'rusty' effect