The Emperor

Emperor
According to the company, Unicum was created by Dr. József Zwack, the Royal Physician to the Habsburg Court, for Emperor Joseph II in 1790. In 1840 the family founded J. Zwack & Co., the first Hungarian liqueur manufacturer.
— The Zwack Unicum History
Emperor being poured

The Emperor 

Adapted from The Spruce Eats

1 1/2 ounces Zwack Unicum Herbal Liqueur
1/2 ounce sweet vermouth
1 tsp orange curacao
optional: orange twist for garnish

Combine Zwack, vermouth, and curacao in a cocktail shaker filled with ice. Stir well until well-chilled. Strain into a martini or coupe glass. Garnish with optional orange twist.