Kitchen torch Searing Short-Rib
This brought to mind a similar question that I was recently asked about the use of other flammable gases in cooking. As is often the case at The Cooking Lab, one question leads to another and before I knew it, my short answer had grown beyond the scope of the original question.
We cover the topic more extensively in another artical, but here is a brief description of how the use of a kitchen torch and the type of gas therein can affect the flavor.
Natural gas (methane) is a common fuel for ranges and stovetops, but most kitchen torches used for cooking are fueled by propane or butane. Fuels like oxyacetylene and MAPP gas, however, typically burn hotter and thus can impart a larger amount of heat to the food for a faster sear.
The type of gas that you choose isn’t as important as the completeness of its combustion. Propane, butane, MAPP, and acetylene are all great so long as you adjust the flame of the torch so that it is a fully oxidizing flame. This is a flame that is produced with an excess of oxygen, either from the surrounding air or supplemented with compressed oxygen. You can tell that you have an oxidizing flame when the torch is burning dark blue, is relatively short in length, and hisses and roars. Frequently, people have too large of a flame that is burning yellow at the tip. This is a reducing flame, also referred to as a carburizing flame because there are uncombusted hydrocarbons from the fuel in the flame that will end up in the food, imparting an unpleasant taste. In my experience, kitchen torches are especially prone to this, but it can happen with any kitchen torch that hasn’t been properly adjusted before aiming it at the food.
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