Making an espresso martini is fairly easy. You need a cocktail shaker, vodka (vanilla vodka if you have it), coffee liquor (Kahlúa), creme de cacao, a shot of espresso, and some espresso beans for a garnish. The only other thing you need is some stamina to shake for 20 seconds. If you want a nice foam on top, there are a few tips to make you look like a pro.