Mouthfeel is a little syrupy w/o the champagne - I wonder why this is seen as a passionfruit-driven riff on a Porn Star Martini when a PSM includes two passionfruit-flavored ingredients also? Anyway, I tweaked w/ an oz. of lime juice and 3/4 oz of simple syrup plus a few drops of vanilla extract (to fake a slightly sweeter vanilla syrup).