Liquid smoke is a substance produced from smoke passed through water. Liquid smoke is used for both food preservation and flavouring. Liquid smoke consists of smoke produced through the controlled burning of wood chips or sawdust, condensed and then passed through water, which captures and dissolves the smoke-flavoured components in solution. This base can be condensed and modified through many methods to develop a wide range of smoke flavours.
Liquid smoke is often used in the processing of bacon and hot dogs, and is one of the main flavours in the curing solution used for bacon. It is also used to flavour jerky and tofu. Liquid smoke is also used in some soft cheeses and tempeh.