Gin or vodka, dry vermouth, and olive brine — the savoury, salty martini that divides bartenders.
The Dirty Martini first appears in recipe books in the early 1900s. The 'dirt' refers to the olive brine, which was originally added to a standard gin Martini. By the mid-20th century, vodka had become the more common base — but classicists still insist on gin, arguing that the botanical complexity plays better against the saline brine than neutral vodka does.
The quality of the olive brine matters enormously. Use brine from a jar of proper pitted green olives (Castelvetrano, Manzanilla, or Gordal are all excellent). Never use brine from a can or a jar of stuffed olives with synthetic brine — it tastes industrial. The amount of brine is a personal preference: ½ oz is a starting point; real dirty martini lovers use more.
Use 1 oz of olive brine instead of ½ oz. Sometimes called 'extra dirty'. The salt and umami completely dominate.
Replace the olives with 2–3 pickled cocktail onions. A different savoury note — sharper, more vinegary.
Omit the olive brine entirely. 5:1 gin to vermouth, stirred. The purist's martini.