Butane torches are frequently employed as kitchen gadgets to caramelize sugar in cooking, such as when making crème brûlée. They may be marketed as kitchen torches, cooking torches, or culinary torches. Use of the butane torch in the kitchen is not limited to caramelizing sugar; it can be used to melt or brown toppings on casseroles or soups, to melt cheese, and to roast or char vegetables such as peppers.
Rapid heating of slabs of meat for some weird meat effect rich people pay for
They are not actually that expensive. You just feel posh when you use one.
My girlfriend came with one, it’s great for grilled cheese. But I’m not allowed to use it anymore because I set fire to a chocolate bar.
https://en.wikipedia.org/wiki/Butane_torch