This is a really handy and quick recipe to use up leftover celery that we all seem to have in our fridge! It's a bit tart because it's semi pickled, sort of salsa-like and and intriguingly tasty, thanks to the surprising combination of caraway seeds and dill. If you don't have either of these, you can even skip the fresh herbs altogether - see notes for alternative suggestions. Serve as a side salad, or as a little dish of pickles to accompany a meal.