Step 1.
- Chill an Old Fashioned glass by filling it with ice water and setting it aside.
Step 2.
- In a mixing glass, combine 2 oz of barrel-proof whiskey, 0.5 oz of sweet vermouth, and 2 dashes of Angostura bitters.
Step 3.
- Fill the mixing glass with ice and stir until well chilled, about 20 seconds.
Step 4.
- Empty the chilled Old Fashioned glass of water and ice.
Step 5.
- Strain the mixture into the prepared glass over a large ice cube.
Step 6.
- Express the oils of a twist of orange peel over the drink, then add it as a garnish.