At Ijen, we turn leftover cooking oil into zero-waste candles – and you can, too. Save your used cooking oil and create natural light at home. Used cooking oil isn’t great for the environment, but it needn’t go to waste. This process, which we developed for our zero-waste restaurant Ijen, transforms leftover oil into eco-friendly candles. They’re easy enough to make at home – you just need some beeswax, a piece of string and a jar or bowl for the mix to set in.. If you want to up your game…