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.
https://en.wikipedia.org/wiki/Butane_torch