Yakitori is prepared with small pieces of chicken meat, skin (torikawa - that's my favorite) or organs, which are prepared with salt or with a mirin, sake and soy sauce, stuck on a skewer and grilled.
I usually eat yakitori during festivals - here's a photo taken during the New Year celebrations at the Senso-ji Temple in Asakusa. The friendly seller was also selling grilled shellfish, made with the same recipe. Really, really tasty...
EXIF info:
Nikon D90
Lens: 8-16mm F/4.5-5.6G
Focal Length: 16mm
Aperture: F/5.6
Shutter Speed: 1/60s
ISO Sensitivity: ISO 640