Shake and strain (or build), rocks, lowball.
Several variations exist in the reference, getting progressively more complicated (including eventually lemon, mirto, and absinthe). The recipe shown here is relatively simple and still very good. Correct title of a revised version of this cocktail is Second Bounce because it was the second attempt at making it. Therefore I've renamed previously untitled cocktail First Bounce. Was originally posted incorrectly as Second Boz