1. Saute onion in olive oil in a stock pot until translucent, about 5 minutes.
2. Stir in 1 teaspoon salt. Add celery, carrots, sweet potatoes, tomatoes, ginger, garlic, jalapeno, stock and coconut milk, and bring to a boil. Reduce heat and simmer, covered, until vegetables are very soft (about 1 hour).
3. Puree soup in a blender and put through a food mill or wire strainer. Add agave, lime juice, pepper and salt.
4. Reheat and garnish each bowl with cilantro to serve.
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