Rice balls (also known as onigiri) are a staple of the Japanese diet like the sandwich is of the American diet. Rice balls are actually much more commonly eaten in Japan than sushi because they are perfectly portable and delicious and so easy to prepare. With a little bit of rice, you can take whatever you’ve got in the fridge and create the perfect snack or meal. The rice ball actually dates back to the days of the Samurai, when they used to carry rice balls as a quick meal during wartime. In Japan today, you will find an abundance of onigiri in most convenience stores or markets as a grab and go item and packed in lunches for children and adults alike.