Keystone Highball

Fill a highball glass two-thirds full with ice.

Stir to chill the glass, then drain off any excess water.

Pour the mint tea, St-Germain, and whiskey into the glass, stirring gently to combine.

Pour the club soda down the side of the glass to preserve its carbonation.

Add more ice and finish with a final splash of club soda.

Express the lemon peel over the drink to release its oils, then discard the peel.

Garnish with a fresh bay leaf.