Jimmy uncovers the tricks and techniques that food producers use to ensure we can enjoy favourite foods whenever we want. In the barn, Jimmy makes a first attempt at turning some of his own farmed pork into square sandwich ham. He also tries to copy the trick that banana suppliers use to artificially ripen green imported bananas so they are ready for the supermarket. Jimmy copies the square ham factory production processes using 100 hypodermic needles, a bicycle pump, a cement mixer, a tin bath and a length of square drainpipe. He completes his investigation into science trickery by discovering how fish farmers fool their fish into believing it's summer when it's winter, so that farmed salmon is available all year round. He also uncovers the trick farmers use to produce mushrooms out of season.