Onigiri time has become as much a part of my day as tea time. I love these little filled balls of rice! Usually I eat them to tide me over in between meal times but sometimes I use them as a filler when my lunch is too small.
Up here in Niigata, I noticed that the convenience store people always ask me if I want my onigiri heated up. Must be a 'cold place' thing. It doesn't sound good to me as I've only ever had them cold. But, I recently went to a local restaurant where they brought us fresh shiso (a Japanese herb) and umeboshi (pickled plums) onigiri that were warm...delish!
This link goes to a BBC food site. It's been about 8 years since I left Britain now and there was very little if any Japanese food there then. So it is kind of interesting to me to see onigiri discussed in detail.