Which ingredient is included in a Desert Dry Martini?

A Desert Dry Martini is characterized by its use of dry vermouth, but in a minimalist approach. The concept of "throwing away" dry vermouth implies that only a minimal amount is used, often enough just to coat the inside of the glass, enhancing the gin's flavor without overpowering it. This preparation aligns perfectly with the idea of a Desert Dry Martini, where the emphasis is on the gin itself, making it a very dry version of the classic martini.

When considering the other options, sweet vermouth would clash with the dry nature of the drink, while 3 oz of gin would typically make for a very strong martini, as the standard recipe usually calls for much less. Dark rum is entirely unrelated to the martini family and would not be used in this context at all. Therefore, the use of dry vermouth, particularly in such a minimalway, is what defines the Desert Dry Martini.