Bitter Enemy

I threw this together on a whim, trying to incorporate some of my favorite ingredients. It's very bitter, pretty strong, and really not very friendly, hence the name. But here it is, all the same:

• 1.5 measures gin
• 1/2 measure Campari
• 1/2 measure dry vermouth
• Dash absinthe

Shake it with ice, strain, and beware. Garnish with a maraschino cherry, for irony.