In the preparation of a Dirty Martini, which of the following is not a step?

In the preparation of a Dirty Martini, the steps typically involve chilling the cocktail glass, shaking the ingredients with ice, and then straining the mixture into the glass. The defining element of a Dirty Martini is the inclusion of olive brine, which adds a savory flavor to the traditionally dry cocktail.

Mixing with soda is not a standard step in making a Dirty Martini. This drink is intended to be served straight, highlighting the flavors of the gin or vodka along with the olive brine, rather than being diluted or lightened with soda. Therefore, excluding soda from the preparation process aligns with the authentic and intended character of the Dirty Martini.