Measure the whiskey, vermouth, and campari into a cocktail mixing glass. Add enough ice to cover the liquid. Use a cocktail stir spoon to stir until the liquid is chilled – about 30 seconds.
Place a few pieces of fresh ice into a rocks glass or an old fashioned. Strain the liquid into the glass and over the ice. Garnish with an orange twist which you cut right over the glass. Serve immediately.
Notes
Two glasses are pictured, but the recipe makes only one drink.