How to Make It
Fill two glasses with ice. In one glass, mix equal parts gin, sweet vermouth, and Campari; Stir to chill. Pour one stovetop pot or one shot of espresso into the other glass; Stir to chill.
Strain liquor into a third, empty glass. Add strained, chilled, espresso, ½ part or to taste.
Squeeze orange peel over the glass, wipe it around the rim, and add to the cocktail.