Thanks I substituted a combo of cumin seeds and some mustard seed. Worked out great. ( cheesy Cauliflower soup) Even better bonus was that I remembered I still had a partial loaf of good crusty rye bread so I toasted it up and served with the soup. Caraway in the end as it turned out. Thanks!!!
The only thing I can think of that even comes close (and it's not all that close) would be Fennel Seed. Inasmuch is it's a soup you're working with, some Cumin might hold up to the flavor demands you describe.