Daiquiri
The Daiquiri is the honest opener, just white rum, fresh lime, and sugar in a roughly 2:1:1 build that hides nothing. Constantino Ribalaigua refined it at Havana's El Floridita in the 1920s. Serve it first and very cold. If it tastes sharp or flat, your guests learn to read balance before the spirits get heavier. Best for palates that think they dislike rum.