St Patrick's day DISASTER there is no Jameson's in the house.
There is though some Middleton...
Middleton is a premium spirit, so I'm pretty loathe to go with plan A) which is "everyone's Irish" from the savoy book as the Chartreuse & Creme de Menthe are likely to kill the whiskey dead. The Blackthorne however is pretty much a Manhattan with the bonus of a dash of absinthe.
60ml Irish Whiskey
30ml Sweet Vermouth
Dash Angastoura bitters
garnish is a lemon twist (if you have one).
The absinthe pays for itself here, the anise taste is submerged in the drink, but the mouth feel gives a menthol coolness making the entire thing taste fantastically clean & strong.
Job for the weekend, try it with an inferior whiskey & see how the taste alters