Broccoli Rabe and White Bean Soup

This soup, though simple, is delicious. It's a spring tonic in the dead of winter. The bitterness of the rapini and the creaminess of the beans adds interest to each bite. Using Parmesan rind is brilliant and frugal. Adding toasted bread and Parmesan at the end makes it a meal in a bowl. The soup freezes well in individual portions - just heat and top with bread and cheese.

Just made this dish and am confused about the complete lack of flavor. I was concerned about water only so I split water with vegetable broth. I also added extra garlic. Nothing, not a thing. The bread did help, but not enough. Suggestions for improvement: cooking carrots and celery along with the onion, perhaps some dry or fresh herbs, can of diced tomatoes.