Sweet sauce for Peking Duck? I've always wondered what sauce they served with Peking Duck at various Chinese restaurants (at least in Australia anyway). Whenever I order Peking duck as takeout, they normally provide a cute little container with a dark liquidy sauce which has a rather sweet taste. 

I'm inclined to believe that it could be sweet bean sauce as suggested at various places on the internet but from what I can tell, it's supposed to have a thick consistency. However, this is not the case here. Any ideas what it could be?

It's consistency and colour is very reminiscent of soy sauce but the taste is sweet, like black bean.
In America that sauce is hoisin sauce or possibly (very much less likely) duck sauce or plum sauce. Any of these can be found for purchase easily, or they can be made from scratch.