The Olive in a Martini (and the Dirty Martini)

For a great many drinkers there is no argument: a martini wants an olive. But the olive does more than decorate the glass — it seasons the drink and gives you a savoury full stop. Here is how to choose it, and what actually makes a martini dirty.

The olive garnish is as old as the martini itself, and it earns its place. A good olive seasons the drink with a whisper of salt and gives you something savoury to finish on when the glass is empty. Get it right and it is part of the cocktail; get it wrong and it either does nothing or bullies the gin off the stage. The choice is small but it is not trivial.

Which olive to spear

You want a firm green olive that will not overpower the gin. The modern favourite is a mild, buttery Castelvetrano — sweet, bright green and almost fruity. A small Spanish Manzanilla is the classic, and the familiar pimento-stuffed olive is a pimento-stuffed Manzanilla nine times out of ten. A big Gordal works if you want a showpiece. What you should avoid is a soft, winey black olive such as a Kalamata: delicious on its own, but it turns the drink muddy and sour. By tradition you spear an odd number — one or three.

What makes a martini ‘dirty’

A dirty martini simply adds a splash of olive brine to the glass, turning the drink cloudy and salty-savoury. That is the whole trick — and it means the brine matters as much as the gin. The murky liquid from a jar of good olives makes a far better dirty martini than the harsh, additive-laced stuff from cheap ones. A useful test: if you would happily eat a spoonful of the brine, it belongs in the glass. If it tastes of nothing but salt and citric acid, it does not.

Brine is an ingredient, not an afterthought

This is the part most home bartenders miss. Once you accept that the brine is a proper ingredient, you start keeping a jar of genuinely good olives just for its liquid, and some bars now hold a dedicated ‘olive juice’ for exactly this. Stuff the olives yourself, or buy a jar cured without a wall of preservatives, and your dirty martini jumps a whole class. The gin gets the credit; the brine does half the work.

Olive	Character	Martini verdict
Castelvetrano	Mild, buttery, sweet	Ideal — crowd-pleaser
Manzanilla	Small, firm, savoury	The classic choice
Pimento-stuffed	Manzanilla + sweet pepper	Reliable, familiar
Gordal	Large, meaty	A showpiece garnish
Kalamata	Soft, winey, dark	Avoid — muddies the drink

Getting it right

• Choose a firm green olive; keep soft black olives for the plate, not the glass.
• For a dirty martini, use a brine you would happily taste on a spoon.
• Spear an odd number — one or three — by tradition.
• Chill the olive along with the glass so it does not warm the drink.

The martini olive: common questions

What kind of olive goes in a martini?

A firm green olive that will not overpower the gin — a mild Castelvetrano, a small Manzanilla, or the classic pimento-stuffed olive. Avoid soft, winey blacks like Kalamata.

What makes a martini dirty?

A splash of olive brine, which turns the drink cloudy and salty-savoury. The quality of that brine matters as much as the gin.

Why an odd number of olives?

Tradition. One or three olives are speared; an even number is considered unlucky by superstitious drinkers. It makes no difference to the taste.

Can you use Kalamata olives in a martini?

Best not to. A soft, winey black olive overwhelms the gin and turns the drink muddy. Keep Kalamata for eating.

Does the olive brine need to be special?

For a dirty martini, yes. Brine from a jar of good olives tastes far better than the harsh liquid in cheap jars — if you would eat a spoonful, it belongs in the glass.

An evergreen guide to the martini olive and the dirty martini; house original.