We invented a twisted tape “swirler” (TT) pack that consists of three steel rods formed and twisted. It fits over a cookstove like a pot rest and facilitates better mixing of air and volatile fuel gas. This reduces firewood consumption by 20% and drastically reduces the amount of harmful smoke emitted. The inconvenience involved with firewood collection is alleviated with increased fuel efficiency, less fuel usage and soot deposition, and 25% reduced cooking time. The TT pack is able to retrofit over a firewood cookstove without requiring any modifications. Raw materials are sourced locally or transported from a nearby city and local blacksmiths can make hundreds of units per day for less than US$0.60 each, taking less than 60 seconds to install on a stove.