A few things to consider:
It implies to serve this cold. If that's what you're looking for, go for it! However, I chose to make it warm. First, just keep the rice warm when you stir in the onions and sauce. Also, I cooked the peppers in the remaining sauce for a few minutes then added the beans and cilantro. I put a lid on it and let is cook over medium-low heat for about 5 minutes or so, just to heat it through. I liked the idea of not only serving it hot, but also giving the peppers a little cook time to soften them up. It worked well!
CLICK HERE for the recipe!