Rice balls (Onigiri) are a convenient take-out food, like sandwiches. The most common shapes are round, oval and triangular. To make a rice ball, you squeeze lightly salted steamed rice into the desired shapes with your hands. Also, it is popular to put pickled plums, chunks of salted salmon in the middle of a rice ball. Rice balls are often wrapped in dried laver seaweed so as to make handling them less sticky.