One of the most common versions is Mitarashi dango, coated in a sweet syrup made from soy sauce. Originally made at a tea house from Kyoto called Kamo Mitarashi, located near the Shimogamo Shrine, the name is said to come from the similarity between the dumplings and the bubbles made by the purifying water (mitarashi) from the shrine's entrance. There's also a story that originally the Mitarashi dango was served skewered in groups of 5, the top one representing the head, the next two the arms and the last two the legs...
Anyway, they're delicious! But, although the Mitarashi dango is commonly sold in konbini, I prefer buying them from specialized dango shops - these are less sweet and much tastier than the ones from konbini...
EXIF info:
Nikon Df
Lens: 24-70mm F/2.8G
Focal Length: 70mm
Aperture: F/2.8
Shutter Speed: 1/500s
ISO Sensitivity: ISO 640