I recently brewed a smoked vanilla porter and the vanilla flavor is tasted as the beer hits the tongue followed by the roasty/smokey flavor of the porter. I brewed the porter as normal, but added the vanilla into secondary.
Ideally, I would like to taste the roasty/smokey flavor first followed by a vanilla after taste. What, if anything, in the brewing process would affect the order in which flavors are tasted? (I'm specifically looking for info relating to adjuncts like my vanilla example, not hops.)