Are you supposed to use bitters in a perfect manhattan, i.e., one using both sweet and dry vermouth? Thanks.
By definition, a Manhattan cocktail has bitters.
Without doubt or fail.
I always thought that a "Perfect Manhattan" (as opposed to a perfect "Manhattan") had Rye or bourbon, 1/2 sweet and 1/2 dry vermouth, and still had Angustura bitters. It was also garnished with a lemon twist rather than a cherry.