What is the main ingredient in a Velvet Hammer cocktail?

The Velvet Hammer cocktail primarily consists of vodka as its main ingredient. This cocktail is known for its smoothness and creamy texture, which is achieved by combining vodka with other ingredients typically, including cream and a liqueur like orange liqueur. Vodka serves as the base spirit, providing the necessary alcohol content while allowing the other flavors to shine through without overpowering them.

In the context of the other choices, while these liqueurs can contribute unique flavors to various cocktails, they do not form the base of the Velvet Hammer. Amaretto adds nutty sweetness, dark creme de menthe provides a minty flavor, and Kahlua offers a coffee taste, but none of these is central to the structure of a Velvet Hammer cocktail. Thus, vodka's role as the main ingredient is crucial to achieving the signature profile of this drink.