Found this video on Instagram from Susanna Yoon of Stick with Me Sweets. This is the holy grail of marshmallow to me. It pipes in easily, pretty much self-levels then sets up like a marshmallow. Of course there is no hint as to how she makes it.
Here is how it sets up (it's the one of the bottom left):
If you aren't familiar with her, check out her Instagram. She is truly a master - her ganaches are perfect - shiny and smooth. The insides of her bonbons are just perfection to look at. And I have never seen anyone work so cleanly and precisely. Plus she is a jedi-level master at piping.
