Place the tomatoes, onion, garlic and peppers into a small saucepan, add the salt and bring to a boil on the stove.
Reduce the heat and boil for 10 minutes
Remove from the heat and let cool for several minutes.
Drain off excess liquid from the pan. (Mine had about 2 or 3 tbsp)
Place the contents into a blender or food processor, add the cilantro and cumin and blend until pureed.
Adjust seasonings and serve warm or cold