In a saucepan place the black glutinous rice and short grain white rice. Rinse under cool water to remove the starch from the rice. Drain the water. Repeat rinsing until the water becomes clear. Completely drain the water once it becomes clear.
Add 1 ½ cups (375 ml) of water to the pot. Make sure the rice sits flat on the bottom of the saucepan.
Over medium to high heat, bring the pot to a boil. Stir the rice gently. Once the water is boiling reduce the heat to low and place a lid on it. Cook for 20 minutes.
Keeping the lid on the pot, turn the stove off and remove the pot from the stove. Allow the rice to rest for 10 minutes.
Take the lid off the pot and use a fork to gently rake the rice to separate the grains. Serve.
Notes
If you want your rice to be a darker purple, add a bit more black glutinous rice before cooking.
Make sure to rest the rice with the lid on after it has finished cooking. This is because the rice will continue to cook even with the heat off.
Be sure to completely drain the water after rinsing. Otherwise, you may end up with too much water when your rice is cooking. This may make the rice too soft and mushy.