This ketchup goes well with just about anything. It is especially good with fried fish and rice.
In a large sauté pan over medium-high heat, cook all ingredients until tender, about 1 hour.
Transfer mixture to a blender and puree until smooth. Pour the ketchup through a fine sieve into a medium bowl.
Season to taste with salt and pepper.
If you don't have it, substitute tamarind fruit with 1 tablespoon cooked tamarind pulp or tamarind paste.
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