Cut the peppers in half and remove the seeds with a spoon. Then chop the peppers coarsely.
Chop your onions coarsely. This is really just to make things a little easier on your processor.
Place all ingredients in a food processor and blend until it reaches the consistency you like best.
This is what it looks like with and without the cilantro added. The cilantro flavor is not overpowering. It just adds a nice, subtle flavor enhancement. Add salt to taste.
Notes
Please note that the nutrition data below is a ballpark figure. Exact data is not possible.