Big Island-based eatery to test Oahu market on Wednesdays Right now, the Ultimate Burger's only brick-and-mortar location can be found at Kona Commons on the Big Island. But owners Jeff Carzino and spouse/chef, Windy Gerardi, hope to soon change that. Starting Wednesday, August 17, Carzino and Gerardi will give Oahu residents a taste of their "ultimate" burger, which is composed of 100 percent grass-fed, free-range beef from local ranchers. "We try to use everything local, fr