1⁄2 oz Curaçao, Pierre Ferrand Dry Curaçao
4 ds Bitters, Dr Adam Elmegirab's Orinoco Bitters (3-4 dashes)
1 twst Orange peel (expressed and discarded)
Stir, strain, up, twist.
You can also use wormwood extract or wormwood bitters to punch up the bitterness of the vermouth to late 19th Century levels. Otherwise, consider cutting back on the orange liqueur and vermouth a bit for a dryer balance.
The Dead Rabbit, NYC.
Irish whiskey, Sweet vermouth, Curaçao, Bitters, Orange peel