Dead simple really.
Expert Building: Sausage Smoker.
2 sausage + 1 Coal = 1 Smoked Sausage.
Production time base : 24:00
Provision house buff : 120fish + 60bread + 40 smoked sausage = 1 Smokey's Sausage Fest.
Smokey's Sausage Fest = x2 prodution for 12 hours.
Put the amount of sausage required to make the buff up and given that a 2:1 conversion on the normal base. What do you think ? I think it's a fairly good trade off compared to a normal buff, but more expensive but I would be willing to sink a 12hr/18hr buff over a 6hr at a 2:1 sink on a top end resource. Expert building status gives a bit of an "elite" feel to the buff too... I like smoked bratwurst. If the sink isn't big enough you could double the fish and bread requirement without annoying me too much, but I think the sausage sink is enough personally.
Well, there ya go.