In 2014, Douglas McMaster opened his restaurant Silo in Brighton, billed as the world's first zero-waste restaurant. He has since moved Silo to London and continued to redefine the meaning of zero-waste in both the kitchen and dining room. In this, his first episode of Behind the Pass, Doug shows us around the restaurant and reveals some of the innovative ways they make use of waste products, before demonstrating how and why Silo mills its own flour rather than buying it in.