Rinse rice under cold water and drain well.
Place rice and 500ml (2 cups) of water in a saucepan and bring to boil. Decrease heat to low and simmer uncovered for 12-15 minutes, stirring occasionally, until the water is absorbed. Remove from heat and let stand with lid on for a further 10 minutes.
Use a sharp knife to slice the rolls at 2cm intervals. Serve with pickled ginger, soy sauce and extra wasabi.