You've heard of turning water into wine - how about turning wine into vinegar? A Tauranga food company believes it may have hit on a use for the country's wine glut, with a white balsamic vinegar made from sauvignon blanc grapes. Newly established AvoHealth's white balsamic and avocado oil salad dressing is one of a range of products it plans to launch in Europe. White balsamic is not new, but founders Chris Nathan and Andrew Logan said no one had made it from sauvignon blanc nor mixed it with extra virgin avocado oil.