Written by Jonathan Eisenthal
When Jon Roisen gave up his farrow/feed hog operation around the turn of the 21st century, he felt a bit of a void. He and his son Aaron were leafing through an AURI publication celebrating the relatively new cold-hardy wine grape variety, pioneered by University of Minnesota, called Frontenac.
They looked at each other and said yes to wine grapes.
Aaron went to New Zealand to learn oenology and the art of being a vintner,