There is a great variety of senbei in Japan, in various shapes, sizes and flavors... but my favorite is the simple salty version, brushed with soy sauce and the ones wrapped in nori.
You can find some of the best senbei crackers in the traditional shops from tourist areas but they are also available in convenience stores (conbini).
EXIF info:
Nikon D90
Lens: VR 18-55mm F/3.5-5.6G
Focal Length: 18mm
Aperture: F/5.6
Shutter Speed: 1/1200s
ISO Sensitivity: ISO 200