The present invention relates to a method for purifying a tar containing gas stream. The method comprises the steps of: a) contacting a tar containing gas stream with a washing liquid in a washing unit to obtain a tar containing washing liquid and a purified gas stream; b) adding an extractant to the tar containing washing liquid to obtain an extraction liquid comprising a tar containing extractant and a regenerated washing liquid; c) cooling the extraction liquid; d) after cooling, separating the tar containing extractant from the regenerated washing liquid, and e) recirculating the regenerated washing liquid to the washing unit.