Heat oil in a large pot and sauté onion until softened. Add garlic
and sauté 2 minutes. Add remaining vegetables and sauté 5 minutes.
Add broth, tomato paste, cumin and seasonings, to taste. Bring
slowly to simmering point, and cook for 30-45 minutes. Cool a little
and blend until smooth. Warm through and adjust seasonings.
Mix all the lamb meatball ingredients together. Roll into small
balls to make approximately 18. Drop into soup and cook for 12 minutes.
Serve meatballs in the soup, garnished with chervil.