1. Coarsely chop green onions, celery and garlic in food processor. Heat oil in large pot over medium heat. Add onion mixture and pinch of salt. Saute 3 minutes, stirring occasionally. Add broth, and bring to a boil.
2. Add broccoli, green beans, macaroni, half of parsley and Parmesan rind. Cook 10 minutes over high heat, stirring occasionally.
3. Remove Parmesan rind. Puree soup in small batches in food processor, and return to pot. Stir in pepper to taste.
4. Serve sprinkled with remaining parsley and a little grated Parmesan