Bring to boil 4 cups water 1 cup of white rice and 1 cup of forbidden rice, 1.5 teaspoon salt, 3 teaspoons butter.

Reduce heat and simmer, covered, for 15-20 till the rice is soft.

In another pan, bring to boil 2 cups of water, 1 cup of white rice, 1 teaspoon salt and 2 teaspoon butter, reduce to simmer for 15-20 minutes till rice is soft.

Combine all the rice, gently, so the white remains white to achieve the look of 3 colors.

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I served the rice as a side dish to a Chicken and Olives so I arranged the rice around the chicken in an oven-proof dish and warmed them up together before serving. 

 

Note:
This recipe happened accidentally. I wanted to serve white and black rice that were mixed together.
I suspected that I should cook them separately otherwise the white rice will turn black during cooking. Yet, I wanted to save some work, so I cooked them together. The result was a nice mixture of purple and black. Realizing that saving work did not give me the result I was looking for, I cooked another cup of white rice and mixed the two bowls of cooked rice together to get a 3 colors rice dish.