NOVELTY - The method comprises introducing an organic material into an interior of a retort (4) at an inlet region (18) of the retort, advancing the organic material through the interior by rotating an auger extending through the interior, disrupting any plugs of the organic material in the interior by providing members fixed to the retort and projecting into the interior, where the members coincide with longitudinally extending gaps in a flight, and preventing formation of plugs of the organic material by limiting a volume of the organic material introduced into the interior of retort.    USE - The method is useful for converting organic material such as wood waste or agricultural waste to charcoal by anaerobic heating in retort tube.    ADVANTAGE - The method is capable of continuously, rapidly and economically converting the organic material such as wood waste or agricultural waste to charcoal while reducing or eliminating plug formation and congestion.    DETAILED DESCRIPTION - The method comprises introducing an organic material into an interior of a retort (4) at an inlet region (18) of the retort, advancing the organic material through the interior by rotating an auger extending through the interior, disrupting any plugs of the organic material in the interior by providing members fixed to the retort and projecting into the interior of retort, where the members coincide with longitudinally extending gaps in a flight, preventing formation of plugs of the organic material by limiting a volume of the organic material introduced into the interior of retort by widening a diameter of the core at an upstream end of the auger, reducing buildup of the organic material at an outlet region (20) of the retort by providing a fin on a downstream end of the auger, allowing exhaust gases to be released into a path defined by an offset of a longitudinal axis of the auger in relation to a longitudinal axis of the retort, and allowing continuous venting of exhaust gases from the retort to a gas condenser. The auger comprises a core and flight. The gas condenser comprises branches, where the flow of exhaust gas to any particular branch is directed to the other branches during removal of any buildup of organic material in that particular branch.    DESCRIPTION OF DRAWING(S) - The diagram shows a cutaway side view of a retort.    Retort (4)    Furnace (6)    Chute (10)    Inlet region (18)    Outlet region. (20)