1 1/2 oz of Irish whiskey (or whiskey)
3/4 oz of dry vermouth
1/2 oz of Lemon Juice
1/2 oz of grapefruit juice
3/4 oz of simple syrup
1 dash of orange bitters
1 1/2 oz of soda water
1 twist of lemon peel
Shake, strain into a Collins over fresh ice and soda, garnish.