Chop the red and white onions and fry until light brown in a pot.
Add the remaining ingredients.
Heat the sauce to boiling point, then let it simmer for at least 30 minutes, stirring regularly.
After 30 minutes, you can blend or thicken the sauce to the desired consistency if needed.
Taste the sauce - it should be sweet, tangy, and spicy all at once.
Watch the full process in the video below:
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