From the archives: This is a foundation post for anyone interested in Japanese style bentos based around rice. Edited and updated to reflect some safety related questions. Be sure to read the linked bento safety posts too. Originally posted in October 2007.
Rice is the base carbohydrate for most Japanese style bento lunches, but the idea of cooking rice fresh every day may be rather daunting. If you have a rice cooker with a timer that can be set so that the rice is ready when you want to make your bento it is easier (and recommended if you make bentos daily). Of course this does mean that you need to rinse the rice the night before.
While I prefer to wash the rice the night before and set the timer on my rice cooker, I often freeze pre-portioned packets of rice to use on extra busy mornings. Rice freezes very well if you make sure that it's still warm when you wrap up the portions. This retains the necessary moisture inside the plastic. It's also a good idea to use sturdy, microwaveable wrap such as Saran Wrap.