We have shown how to build a biodiesel grow-op before on TreeHugger and Planet Green; it is not for the faint of heart. Then there is the Fuelpod 2- the Mister Fusion of the biodiesel world. It is "incredibly easy and safe to use" and can cook up 50 litres per day from waste cooking oil, so start making friends with the local chip shop. "With just a 60cm diameter and at only 140cm high FuelPod2 sits easily at the back of the garage and is operated via a compressor. If you’re interested in the science, it uses CE and ATEX approved process with air control to avoid any sparks. Safe Band technology heats the oil in a thermostatically controlled heater within an integral heating tank, prior to mixing with methanol added from a separate tank."