I vaguely recall Warninks Advocaat being on TV at Christmas Time when I was a kid & I decided to try it for the first time in some seasonal cocktails. My version of the Fluffy Duck keeps all the ingredients & ratios the same except I substituted Fever Tree Blood Orange Soda which not only gives the drink an added orange zing but a lovely pale orange layer above the heavier Advocaat mix. Try it! Since mine could be considered a riff on the original I called it the Ducky Fluff :)