What type of garnish is traditionally used with dry vermouth?

In cocktail preparation, the traditional garnish for dry vermouth is an olive or an onion. This is primarily seen in classic cocktails like the martini, where dry vermouth is a key ingredient. The olive adds a savory note that complements the herbal character of the dry vermouth, while the onion is typically used in a Gibson variation of the martini. Both garnishes enhance the drinking experience by contributing to the overall flavor profile of the drink.

Other garnishes, such as a lemon twist, can be used to add a bright citrus note, but they are more commonly paired with gin martinis rather than specifically with dry vermouth itself. A cherry is often seen with sweeter cocktails and doesn't align with the profile of dry vermouth. Cucumber is a garnish associated with specific cocktails as well but is not traditionally paired with dry vermouth. Therefore, olives or onions are the classic choices that highlight the essence of drinks made with dry vermouth.