This drink usually served “built” – that is, the ice is placed in the glass first, and then the ingredients are each poured on top in the order given. We like it because it’s lazy and doesn’t dirty a shaker, but in this case we’re willing to wash the extra dish to get a slightly smoother shaken drink with a really nice velvety texture. Your call.
You can either build the ingredients in the order given in an ice-filled glass, or you can shake it with ice and strain into an ice-filled cocktail or coupé glass. If you serve it built, you can soften the edges a bit by adding a splash of water (or more) at the end.