2. Cut the corn kernels from the cob.
3. Combine the fruit, fruit skins, corn kernels and spices in a large pot with enough water to cover. Cook for approximately one hour, or until the water takes on a deep purple color and is infused with flavors.
4. Strain and let the liquid cool. Add sugar and lime juice to taste.
Adam Rapoport, editor in chief of Bon Appetit magazine and the website www.bonappetit.com, knows his way around a grill. He has edited an entire book on the subject: The Grilling Book: The Definitive Guide from Bon Appetit.