Saute the plantains in the oil and butter with, salt pepper, and cayenne. When the plantains are soft, and the leeks, red onions, carrots, celery, garlic, Thai chili, and the additional salt. Cook until vegetables brown and become tender. Add in the saffron, cilantro, and orange juice. Cook for 5 to 10 minutes. Add the Chicken stock and heavy cream. Bring to simmer and blend with the immersion blender. Cook an additional 20 minutes. Adjust seasoning. Finish by pureeing in vita-mix blender.