It's what's left over from processing sugarcane.

Around 100 truckloads of bogus arrive at the chuck factory every day during peak harvest season, the material dries out the fiber loses strength so we have to keep it in wet piles.

Workers then remove a layer of the tiniest fibers before washing and pressure cooking it.

You use a certain alkaline product to be able to remove the sticky, you know, if you think of a sugary product that's a little sticky, the alkaline solution helps make it Moldable, workers wash the sludge again to remove any residual chemicals, then they distributed into different machines and molds that press it into shape.