If you can't find mirin in your grocery store's Asian food aisle, substitute 1 tablespoon sugar dissolved in 1/2 cup rice wine vinegar or vermouth. From Costal Kitchen, page 106, September 2012 - Chicken Yakitori
Yakitori Chicken Yakitori, literally meaning “grilled chicken”, is a super easy and delicious Japanese food to prepare! Chunks of chicken are served on a skewer with some delicious sweet and salty sauce, like teriyaki sauce, which make it convenient and easy to eat on the go. This is a typical Japanese street market food and also can be bought at regular grocery stores and yakitori-only restaurants.