A "kitchen torch" is a small handheld device that produces a flame. It is used for various cooking techniques like caramelizing sugar, browning the top of casseroles or desserts, and quickly searing or glazing food. Full definition
Hold a small handheld kitchen torch at a 90 - degree angle 3 to 4 inches from surface of meringue. (mattbites.com)
Use a small kitchen torch to lightly brown the frosting, then serve immediately. (52kitchenadventures.com)
If you have a mini kitchen torch, this would perfect to use to brown the marshmallows instead of placing them under the broiler. (dailyforage-glutenfree.com)