I've read references to pourable buttercream here and there. No real recipes that I've found. I tried melting shortening based buttercream in the mircrowave - the sugar became grainy and weird. Then tried heating 1/2 cup whipping cream and mixed it into 2C buttercream. I was able to pour it but it was lumpy and ugly.
Can buttercream be melted and poured so it is smooth when it sets back up?
YES! but only SMBC or IMBC
I tried it with some leftover shortening-based buttercream last week...added a bit of water and heated it just 'til it was liquid...in a bowl over a pot of simmering water and poured it over some mini cakes. I think it would've benefitted from a bit more water. It poured smoothly over the first two then, it began setting quite quickly making the next ones lumpier and lumpier. I did like the way it set up....firm enough to lift without marring the surface.