I recently bought some piping bags and nozzles, and then was given some as a housewarming present, so I was itching to try them out.
My first attempt at piping using a nozzle was a disaster - the piping bag exploded from having too much of my Viennese Finger mixture in... my second attempt - red icing wasn't successful really either... I've learnt that melting the butter then trying to combine that with the icing sugar just won't work, it leaves the mixture too runny. I tried putting the icing into the fridge to set for five minutes but it was still as runny. Last time I made this error I kept adding more and more icing sugar - that didn't work either!
I ended up just letting the runny icing come through the piping bag onto the buns, and then adding my strawberries to the fully covered tops.
I think they still looked good!