Heat a stainless steel, enamel-coated cast iron, ceramic or glass pot over medium heat. Add the ghee, then the leeks. Sauté 10 minutes, stirring occasionally, until softened and golden. Add the remaining vegetables and sauté another 7 minutes.
7 Add the tomatoes with their juice and the remaining ingredients and spices. Bring to a boil, then reduce the heat, partially cover and simmer for 10 minutes.
8 Blend until extra smooth, then finish as above.
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