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Running a Tawi Biochar Harvester for one hour produces enough biochar to fuel a Jiko stove for two hours - that's three hours of cooking, just from a handful of sticks!

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Waste wood can be an excellent source of free energy.

If you have a garden, even a small one, you will find some waste wood (brash). A Brash Kitchen is designed to use that free resource as a fuel in an extremely efficient way.


In a fire, wood burns and reduces to charcoal / biochar. That then burns down to ash. A stove designed to burn wood is not good at burning charcoal and vice versa. A Brash Kitchen aims to optimise the way both elements are burnt.


We have used this system here and in Kenya for over 20 years.

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From brash to biochar

Tawi stoves are extremely efficient at turning brash into biochar. Dedicated cooking surfaces allow you to use the pyrolysis heat at the same time.


When you have finished cooking you scrape out the biochar you have made into a metal container that has an air-tight lid. When the biochar has cooled down completely, add it to your biochar fuel store.


No wood stove is completely smoke free, but a Tawi outdoor stove is just about as good as it gets!


Watch Biochar Harvester instruction video
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Biochar fuel

Dry biochar is a fast lighting, carbon-rich fuel. When burnt in a Jiko stove it produces a huge amount of clean heat which is easy to control. This makes biochar an ideal cooking fuel; better than traditional charcoal.


Watch Jiko instruction video
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What you need in order to run a Brash Kitchen

A Brash Kitchen is a system rather than a design. It is the process that uses a small amount of fuel wood very efficiently by separating the two distinct burning phases.


You can set up a Brash Kitchen anywhere. You will need to buy or make a Tawi stove to produce dry biochar and a Jiko stove to burn the biochar efficiently. You need a metal airtight container to extinguish the hot biochar; an old biscuit tin or saucepan with lid. You will also need a metal container to store your biochar fuel.

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