Do not bring it to boiling point quickly. When it begins to boil, turn heat to high and cook for 1 minute. Since the lid might bounce from the pressure of the steam, it is better to place a weight, or some dishes on the lid. Turn heat to low and cook for 4 or 5 minutes. Reduce heat to the lowest setting for 10 minutes.
Every grain of rice absorbs water and becomes plump.
Turn off the heat and let rice stand, covered with lid for 10 minutes. Mix Vinegar, salt, and sugar in cup and heat until sugar and saltis dissolved. Spread rice evenly over the bottom. You may not need all of it. Use any combination of 3 or 4 veggies, cut into thin strips.