Cut peppers and onions into small enough pieces for a food processor/blender.
Peel all garlic cloves.
Blend a mixture of peppers, onions, garlic, cilantro, vinegar, and oil to an almost liquid consistency. This step will have to be repeated until all veggies have been blended and poured into a bowl where all batches can be mixed in order to yield uniform flavor.
To use, saute a ladle full, prior to adding to your dish of choice.

5 green bell peppers
5 white onions
2 red bell peppers
4 cloves of garlic
1 bush of cilantro
Salt and pepper as desired
1/3 cup distilled white vinegar
1/3 cup olive oil