I bought a Toshiba superheated steam oven 水波爐 a few months ago. It was recommended from a pastry chef who worked as part time demonstrator showing how to use a kitchen machine of another brand for making fabulous food, such as bread, cookies, steamed bun, etc. A Facebook group of Toshiba superheated steam oven exists. Members share tips and recipes. Thanks to the group. I made the purchase decision after reviewing the favourable comments. It has 6 functions:Superheated Steam, Steam, Convection, Oven, Grill & Microwave. One of the great points is fermentation. We are no longer worried about fermentation in the cold weather. This magical oven does the tasks handsomely.
Recently, a recipe of coffee hazelnut swiss roll was posted. I baked mine per recipe. It was not as soft as it could be. But the favour is great. Coffee mixed with hazelnut is superb. It lingered in the mouth for a long while. I think of it then I want to have it again. Hmm!
The recipe is contained in a few jpeg files from Micky Tung. Hope that you can make use of it. https://www.facebook.com/micky.kitchen/posts/1546403815676844