The same ingredients as a Rob Roy, just different measurements.
We tend to be creatures of habit and stick to the same cocktails, partly because we already have the necessary ingredients in our cupboards. The key ingredient in an Army and Navy is Orgeat syrup, a delicious combination of almonds, orange flower water, rosewater and sugar. It’s a fairly unknown ingredient but is definitely worth purchasing and will make a welcome addition to any drinks cabinet.
The Vesper is an International Bartenders Association Official Cocktail and was invented and named by Ian Fleming in the 1953 James Bond novel Casino Royale. It originally contained gin, vodka, and Kina Lillet, which is no longer produced.