So I have been asked to make a fancy smash cake for a kids first birthday. Basically it is a bit more decorated than a regular smash cake hence why I call it a fancy smash cake LOL! Anyways, this party is to take place outside in mid-september which where I live can be in the mid to upper 80's with humidity so I am thinking my regular all butter, buttercream recipe is not going to cut it. I am going to tell the parents that they need to keep the cake chilled until a bit before the smashing begins and I was also going to make one of those cooling boxes with the frozen water bottles for them to transport it/keep it in while they are at the park. But for the buttercream, besides substituting some/all of the butter for shortening is there anything else I can do to keep it from melting too quickly but also make sure it tastes good as well? I know the kid is going to smash it up but I want it to be yummy in case the parents take a bite or two. It is going to look like a circus tent so I also don't want the red and white stripes to bleed/melt together either.
She's in Miami Florida, it's plenty hot & humid there.
Google( Indydebi buttercream icing recipe)cake central member) has a good one . She lives in Indiana