When William and Trina Kay-McPhail decided to open a sustainability-focused restaurant in regional South Australia, they felt it was important to do so in a community that “gets” their ethos. They found it in Willunga, a quaint, leafy town 45 minutes from Adelaide’s CBD. Tread Lightly emerged quietly, without fanfare, marked by the appearance of a simple A-frame sign on the main street in early February. The entrance, tucked behind a former art gallery, leads the way down slate…

