Soak the dried kelp in the water (1 and 1/3 cups) for about 10 mins. Remove the kelp. Keep the water for next step.
Rinse the rice and put it into a rice cooker pot. (If you are going to boil the rice instead of using a rice cooker, soak it in water for about 30 minutes after rinsing it.) Add the water from step 1 in the pot.
Add the prepared ingredients on top of the rice in the following order : radish, carrot, shiitake mushrooms, chestnuts, jujube, oysters. Set the rice cooker timer for 30 mins.
When it is done, serve. To eat, add the rice dressing as required onto the bowl of rice and mix them well.