Pour the rice into a strainer and rinse under cold running water until the water runs clear. Set aside.
In a saucepan' large enough to hold the cooked rice, melt the butter over medium heat. Add the onion and cook, stirring, for 3 to 5 minutes, or until translucent. Add the rice and cook, stirring, for 3 to 5 minutes, or until the rice turns white. Pour in the broth, reduce the heat to