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In the classical bottom-up fire ignition approach, the order of laying the fire is paper, wood then coal. In the "Basa Njengo Magogo" or top-down ignition approach, the order of laying the fire is coal, paper then wood, and few lumps of coal on top at an appropriate time after the fire has been lit. The principle is as follows: smoke is generated at the hot/cold boundary. In the normal bottom-up coal fire ignition process, the smoke rises through the cold coals and thus escapes. In the top-down ignition process, the smoke rises through the hot zone and is consequently burnt.

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