"Boxty is a very simple dish, just grated raw potato, flour, milk and seasoning, but it's important to extract the starch out of the raw potato," he said. Extracting the starch dries out the potato to give the boxty a crisp golden finish when cooked in butter. Gather it up into a clean cloth and keep twisting until all the starch has come out. "Years ago," he said, "people kept the starch for ironing shirts – nothing ever went to waste."