I've tried to figure this out a few times, each time leading to failure, when I saw the buzzfeed recipe thought I have nearly all of that stuff right now, except need a tank of helium, the last birthday party wiped it out. I was also thinking that it probably wouldn't work as shown with out some help, but would be a good start, possibly replacing the sugar with a different one, and using a better thickener than corn starch. Things I have tried that failed a locust bean gum, xanthan gum, isomalt concoction, it kind of gooped and started a small bubble but never expanded nicely although it looked liked it had merit, an agar agar, xanthan gum, isomalt mixture that made a mess in the pan and had no real merit and a gelatin and syrup recipe that had no hope. My notepad from that project is missing and probably has weird stick figures with long legs drawn in it by now so I don't have the ratios of the failed attempts. In the masterchef au recipe, which of the many methylcellulose do you think they are using? They didn't show a bag of it laying around which I was hoping to see in the background. I was kind of leaning towards https://www.modernistpantry.com/methylcellulose-lv.html or https://www.modernistpantry.com/hydroxypropyl-methylcellulose-f50.html as a good start.