Tipperary

1. Fill a mixing glass or cocktail shaker with ice.
2. Pour in the Irish whiskey, sweet vermouth, and green Chartreuse.
3. Stir the mixture gently for about 30 seconds to chill the ingredients.
4. Strain the cocktail into a chilled cocktail glass.
5. Garnish with a lemon twist by twisting the peel over the glass to release the oils, then drop it into the drink.
6. Serve and enjoy your refreshing Tipperary cocktail!

Note: You can also serve this cocktail on the rocks by pouring the mixture over ice in a rocks glass and stirring gently before garnishing. Adjust the amount of Chartreuse according to your preference for a stronger or milder herbal flavor.