It's a substitute for simmered dishes. Seasoned ingredients are placed in a heat-resistant film. You can prepare in advance and you can see the contents as you finish cooking right in front of the customers. The ingredients are placed in the film, and hot jelly made from broth and gellan gum is poured in and the top is tied. It is heated in this state on an induction cooker, spread out, and served, but it can withstand a heat of 220°C, so it can be put in an oven, or heated in a frying pan if it's not over an open flame. Customers are happy that they can see the broth boiling and the ingredients cooking right in front of them, which is what they usually do in the kitchen. I think it can be used for other cooking methods as well. It's useful in cases where you can't show it on the counter.
I work in a hotel and we have a diverse range of customers, including foreign guests, so we put a lot of thought into the way we present and serve our food.