Soak the dried beans, cook until tender and set aside.
Meanwhile, combine all the dressing ingredients and blend well. (This can be done several hours in advance to allow the ingredients to marinate.).
Cook the rice until done.
Drain the warm beans and transfer 3 cups to a large bowl.
Toss the black beans carefully with half of the white onion and half of the dressing.
In another bowl, transfer the rice and toss with the remaining onion and dressing.
On a large serving platter, arrange the beans on one side and the rice on the other side.
Cover and set aside at room temperature for about 1 hour, or refrigerate for up to 2 days.
Adjust seasonings if necessary and garnish with red pepper and parsley (or cilantro) if desired.
