This parsnip and leek soup gets its wonderful flavor from cumin and mustard seeds that you toast in hot oil with garlic. You stir it into this soup just before serving.
I really loved the flavor the fried garlic, mustard seeds, and cumin seeds added at the end. If you make this soup, don't skip this step. The technique for adding the spices is an Indian term called "tarka." The oil draws out the flavor but leaves the whole spices intact to add texture to the dish.
