1. Saute the onions and garlic in the peanut oil 10 minutes.
2. Add the remaining ingredients, bring to a boil, reduce the heat to low, and simmer 10 minutes.
3. Puree in a blender or food processor if you prefer a smoother sauce (optional).
Serve hot or at room temperature. You can cook vegetables or tofu in this sauce, or pour it over previously-cooked food.