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Preheat oven to 450 degrees.
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In a large bowl, combine 2 tbs oil with tomatoes, bell pepper, garlic and spices and mix evenly.
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Spread mixture on large baking pan, two if needed.
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Roast until they darken, about 30 minutes.
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In a large pot heat 1 tbs oil and add onion and cook covered until very tender, 10 minutes.
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Add the broth, tomatoes and bell pepper and heat on medium until boiling.
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Pour into a food processor and pulse until well mixed, in batches if needed.
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Pour back into pot and let simmer for a couple of minutes.
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Add salt, pepper and basil or cilantro to taste.